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  • 1985-1989
  • 1970-1974  (788)
  • 1920-1924
  • 1971  (788)
  • Inorganic Chemistry  (788)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971) 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 21-30 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diastereomers of Nonactin Acid and Epimers of 2-Desmethylnonactin AcidNonactin acid 8a was prepared in only four reaction steps starting from the furan 3a. - In an attempt to prepare nonactin acid by intramolecular cyclisation of 13, the tetrahydropyran 15 was obtained in addition to the desired tetrahydrofuran 14. Treatment of 14 + 15 with sodium cyanide under the conditions of the Kolbe reaction led to the formation of the isomeric acids 16 + 17.
    Notes: Ausgehend von dem Furan 3a gelangt man in vier Reaktionsschritten zur Nonactinsäure 8a, einem 2.5-disubstituierten Tetrahydrofuran. - Beim Versuch der Darstellung von Nonactinsäure durch intramolekulare Cyclisierung von 13 entstand neben dem gewünschten Tetrahydrofuran 14 durch Ringerweiterung auch das Tetrahydropyran 15. Die Umwandlung von 14 + 15 mit Natriumcyanid nach Kolbe führte zu den stellungsisomeren Säuren 16 + 17.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 40-49 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aromatic Solvent Induced Shifts (ASIS) in the N.M.R. Spectra of tert-Butyl-, tert-Butoxy-and Nitro(tert-butyl)benzene DerivativesThe n.m.r. spectra of aromatic tert-butyl and tert-butoxy groups which are not separated in CCl4 may always be resolved in benzene and pyridine solution. In some cases (e. g. 15) assignements for these signals are obtained empirically from their solvent shifts. The signals of the aromatic protons in 2.6- and 3.4-dinitro-1-tert-butylbenzene show remarkable solvent effects (CCl4→C6D6) which cannot be explained by the 1:1 complex models. The shifts induced by aromatic solvents must originate rather from the time average over all orientations of the anisotropic molecules in the nearest solvent schell. The interpretation of such solvent shifts should be based on values derived from an absolute standard.
    Notes: In CCl4 nicht getrennte NMR-Signale für aromatisch gebundene tert.-Butyl- und tert.-Butyloxygruppen werden in Benzol und Pyridin stets aufgelöst und können in bestimmten Fällen (z. B. 15) an Hand der Lösungsmittelabhängigkeit empirisch zugeordnet werden. Die Ringprotonensignale bei 2.6- und 3.4-Dinitro-1-tert.-butyl-benzol zeigen beim Lösungsmittelwechsel CCl4→C6D6 sehr unterschiedliche und z. T. sehr starke Verschiebungen, die nicht mit dem Modell spezifischer 1:1-Komplexe erklärt werden können. Die Wirkung des aromatischen Lösungsmittels muß vielmehr durch das Zeitmittel über alle Orientierungen aller anisotroper Moleküle in der engsten Solvathülle zustandekommen. Auf die Verwendung eines absoluten Standards bei der Deutung von Lösungsmitteleffekten in der NMR-Spektroskopie wird hingewiesen.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 473-478 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 7-β-Neohesperidosyl-4′-(β-D-glucopyranosyl)naringenin, a Flavanone Triglycoside from Citrus FruitsThe glycoside 7-β-neohesperidosyl-4′-(β-D-glucopyranosyl)naringenin (3), isolated from the segments of Citrus paradisi Macf, by Mizelle et al., was synthesized by condensation of phloracetophenone 4-β-neohesperidoside (1) with 4-hydroxybenzaldehyde 4-β-D-glucopyranoside (2) and by cyclisation of the resulting chalkone glykoside. Dehydrogenation of the flavanone triglykoside undecaacetate and subsequent saponification leads to the formation of 7-β-neohesperidosyl-4′-(β-D-glucopyranosyl)apigenin (7), the first synthetic apigenin triglycoside.
    Notes: Das von Mizelle und Mitarbb. aus Citrus paradisi Macf. isolierte 7-β-Neohesperidosyl-4′-β-D-glucopyranosyl-naringenin (3) wurde durch Kondensation von Phloracetophenon-4-β-neohesperidosid (1) mit 4-Hydroxy-benzaldehyd-4-β-D-glucopyranosid (2) und Cyclisierung des entstandenen Chalkonglykosids synthetisiert. Durch Dehydrierung des Flavanontriglykosid-undecaacetats (3a) wurde nach Verseifen das 7-β-Neohesperidosyl-4′-β-D-glucopyranosyl-apigenin (7) als erstes synthetisches Apigenintriglykosid dargestellt.
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  • 5
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Theoretical and Spectroscopic Investigations of Indigo Dyes, XI. Compounds with the Basic Chromophore of Thioindigo: Preparation and Properties of 3.4-Bis(alkylthio)hex-3-ene-2.5-dionesThe nucleophilic exchange of halogen in trans-3.4-dibromo- and -3.4-dichlorohex-3-ene-2.5-dione (4 and 5) with alkanethiols is studied. With bromine as leaving group substitution and reductive debromination leads to the formation of trans-3-methylthiohex-3-ene-2.5-dione (7a). With chlorine the expected trans-3.4-bis(alkylthio)hex-3-ene-2.5-diones (6a-c) are formed. These have the same structure and geometry as the basic chromophore of thioindigo, but they do not show the corresponding typical chemical and spectroscopic properties. They rather behave spectroscopically like β-alkylthio-α,β-unsaturated ketones. Conformation and spectroscopic properties of 6a-e are discussed with respect to the sterical requirements of the different groups at the sulfur atoms.
    Notes: Der Austausch der beiden Halogenatome von trans-3.4-Dibrom- und -3.4-Dichlor-hexen-(3)-dion-(2.5) (4 und 5) gegen Alkylmercaptane wird untersucht. Mit Brom als Abgangsgruppe erfolgt neben einfachem Austausch quantitativ eine reduktive Entbromierung zu trans-3-Methylmercapto-hexen-(3)-dion-(2.5) (7a), während mit Chlor als Abgangsgruppe zweifacher Austausch zu trans-3.4-Bis-alkylmercapto-hexen-(3)-dionen-(2.5) (6a-e) stattfindet. Diese zeigen nicht die spektroskopischen und chemischen Eigenschaften, die man für dieses - in der Verknüpfung ihrer funktionellen Gruppen dem Thioindigogrundchromophor entsprechende - System erwartet, sondern sie verhalten sich wie einfache β-alkylmercapto-α,β-ungesättigte Ketone. Die Abhängigkeit der Konformation und der spektroskopischen Eigenschaften von der Größe der Alkylreste am Schwefel wird diskutiert.
    Additional Material: 4 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 549-557 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, LIV. Chemical Properties of Tris(2.2-dimethylhydrazino)boraneIn contrast to the ready cleavage of BN-bonds in tris(dialkylamino)boranes by BCl3, (BH3)2, HCl or CH3J the prefered reactions of these acids with tris(2.2-dimethylhydrazino)borane (1) are additions. Due to the greater basicity of the dimethylamino group as compared to the NH moiety, additions occur at the group (CH3)2N before the group NH is attacked. Solvolysis of B[NH—N(CH3)2]3 (1) by H2O or C2H5OH yields (CH3)2 N—NH2 and B(OH)3 or B(OC2H5)3, respectively, but no mixed compounds XnB[NH—N(CH3)2]3 n are formed in these reactions or by ligand exchange with B(OCH3)3 or B[N(CH3)2]3. 1 is stable up to 280° at higher temperature condensation with formation of N.N-dimethylhydrazine occurs.
    Notes: Während die Verbindungen BCl3, (BH3)2, HCl und CH3J die B N-Bindungen von Tris(dialkylamino)-boranen spalten, lagern sie sich an Tris(2.2-dimethyl-hydrazino)-boran (1) an. Dabei erfolgt zunächst Addition an die stärker basische Dimethylaminogruppe, danach reagiert auch die schwächer basische NH-Gruppe. Solvolysen von 1 mit H2O und C2H5OH oder Komproportionierungen mit B(OCH3)3 oder B[N(CH3)2]3 führen nicht zu gemischten Verbindungen XnB[NH—N(CH3)2]3 n(X—OH, OR, N(CH3)2). Im Vergleich zu Tris(alkylamino)-boranen ist 1 thermisch sehr stabil. Erst oberhalb 280° spaltet sich N,N-Dimethylhydrazin ab.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 605-638 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: o- and p-(Dicyanomethylene)quinocyclopropenes. Synthesis, Mechanisms of Formation and Propertieso- and p-quinocyclopropenes of the benzene, naphthalene, anthracene, phenanthrene, and fluorene series (9, 12-15, 29, 30b, 37, 38) are prepared a) by thermolysis of 1:1 adducts of 3-ethoxy-1.2-diaryl-cyclopropenylium cations 6 and arylmalodinitrile anions, b) by reaction of diarylcyclopropenones with arylmalodinitriles in acetic anhydride. The reaction mechanisms suggested by isolation of intermediates are discussed. - Polarography of the quinocyclopropenes shows reversible formation of a radical cation in a one-electron step. This is in agreement with calculations according to the simple HMO model, which give satisfactory correlations with polarography, u. v. and i. r. spectroscopical data.
    Notes: o- und p-Chinocyclopropene der Benzol-, Naphthalin-, Anthracen-, Phenanthren- und Fluorenreihe (9, 12-15, 29, 30b, 37, 38) werden dargestellt a) durch Thermolyse von 1:1-Addukten aus 3-Äthoxy-1.2-diaryl-cyclopropenylium-Kationen 6 und Arylmalodinitril-Anionen, b) durch Reaktion von Diarylcyclopropenonen und Arylmalodinitrilen in Acetanhydrid. Die sich aus der Isolierung von Zwischenprodukten ergebenden Reaktionsmechanismen werden diskutiert. - Durch polarographische Untersuchungen wird festgestellt, daß die Chinocyclopropene reversibel im Einelektronenschritt in ein Radikal-Kation übergehen. Dies wird durch Rechnungen nach dem einfachen HMO-Modell bestätigt, die befriedigende Korrelationen mit den polarographischen sowie UV- und IR-spektroskopischen Daten ergeben.
    Additional Material: 5 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 665-667 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 668-670 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 71-74 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on the Bromination of Hydrocarbons in Liquid BromineThe bromination of aliphatic hydrocarbons in liquid bromine in the presence of catalytic amounts of hydrobromic acid is described. Hydrocarbons with neighbouring tertiary carbon atoms and tetraalkylated ethylenes give definite bromination products. From the corresponding hydrocarbons were obtained 1.4-Dibromo-2.3-bis(bromomethyl)but-2-ene (1), 1.4.5-Tribromo-2.3-bis(bromomethyl)pent-2-ene (2), 1.4.5-Tribromo-2.3-bis(bromomethyl)-hex-2-ene (3), 1.4.5-Tribromo-2-bromomethyl-3-(α.β-dibromoethyl)pent-2-ene (4), and 1.4.5.8-Tetrabromo-Δ4a(8a)-octalin (5).
    Notes: Bei der Bromierung in flüssigem Brom in Gegenwart katalytischer Mengen Bromwasserstoffsäure bilden aliphatische Kohlenwasserstoffe mit benachbarten tertiären Kohlenstoffatomen und tetraalkylierte Äthylene definierte Bromierungsprodukte. Im einzelnen werden 1.4-Dibrom-2.3-bis-brommethyl-buten-(2) (1), 1.4.5-Tribrom-2.3-bis-brommethyl-penten-(2) (2), 1.4.5-Tribrom-2.3-bis-brommethyl-hexen-(2) (3), 1.4.5-Tribrom-2-brommethyl-3-[α.β-dibromäthyl]-penten-(2) (4) und 1.4.5.8-Tetrabrom-Δ4a(8a)-octalin (5) aus den entsprechenden Kohlenwasserstoffen erhalten.
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  • 11
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 110-130 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Complex Chemistry of Four-Centre π-Systems, III. Colour, Solvatochromy and Reduction Potentials of (1.4-Diazabutadiene)molybdenum TetracarbonylsMolybdenum tetracarbonyl complexes of the =N=C=C=N-system (1,4-diazabutadiene=DAB) show an intense, low energy electronic transition, which is antiparallel to the ground state dipole moment; its solvent dependance is measured for 33 mostly new compounds and shows directly the amount of metal-ligand interaction, and thus of π-backbonding. The π-delocalisation of metal-D-electrons strongly depends on the substituents of the DAB-system, but the complex ground state has still molybdenum in the valence state 0. The competing mesomeric, inductiv and steric effects of the DAB ligands can be separated, too, by polarographic reduction potentials of complexes and ligands. The results can be understood in terms of simple perturbation theory.
    Notes: Molybdäncarbonyl-Komplexe des =N=C=C=N-Systems (1.4-Diaza-butadien=DAB) zeigen eine antiparallel zum Grundzustandsdipolmoment gerichtete intensive farbgebende Elektronenanregung, deren an dreiunddreißig meist neuen Verbindungen untersuchte Solvatochromie direkte Aussagen über die Größe der Metall-Ligand-Termwechselwirkung und damit über die π-Rück bindung gestattet. Die Delokalisierung der Metall-D-Elektronen ist abhängig von den Substituenten des DAB-Systems, der Komplexgrundzustand enthält aber formal 0-wertiges Molybdän. Die konkurrierenden induktiven, mesomeren und sterischen Effekte der DAB-Liganden sind in den polarographischen Reduktionspotentialen der Komplexe und Liganden selbst ebenfalls genau abgrenzbar, bestätigen die Solvatochromie-untersuchungen und lassen sich im Rahmen einfacher Störungstheorie widerspruchsfrei deuten.
    Additional Material: 7 Ill.
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  • 12
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 138-144 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reductive Silylation of NaphthaleneThe reaction of naphthalene with trimethylchlorosilane and sodium has been found to afford 1.4-bis(trimethylsilyl)-1.4-dihydro- and 1.2-bis(trimethylsilyl)-1.2-dihydronaphthalene (1, 2), whereas potassium reacts to give mainly 1.2.3.7-tetrakis(trimethylsilyl)-1.2.3.4-tetrahydro-naphthalene (3) besides 1.2.4-tris(trimethylsilyl)-1.4-dihydro-(4) and 1.2.4-tris(trimethylsilyl)-1.2-dihydronaphthalene (5). The configuration has been determined by n.m.r. spectroscopy.
    Notes: Bei der reduktiven Silylierung von Naphthalin mit Natrium und Trimethylchlorsilan werden vorwiegend nur 1.4-Bis-trimethylsilyl-1.4-dihydro- und 1.2-Bis-trimethylsilyl-1.2-dihydronaphthalin (1, 2) gebildet. Ersetzt man jedoch das Natrium durch Kalium, so erhält man 1.2.4-Tris-trimethylsilyl-1.4-dihydro- (4) sowie 1.2.4-Tris-trimethylsilyl-1.2-dihydro-naphthalin (5) und vor allem 1.2.3.7-Tetrakis-trimethylsilyl-1.2.3.4-tetrahydro-naphthalin (3). - Die Aufklärung der Konfiguration erfolgte NMR-spektroskopisch.
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  • 13
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 168-172 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of 4-Chloro- and 4-Bromo-2H-chromenes and of 3-Bromo-2H-chromenesDehydrobromination of trans-3,4-dihalochromans yields the 4-halo-2H-chromenes 1-4. Dehydration of cis-3-bromo-4-hydroxychromans leads to the 3-bromo-2H-chromenes 5 and 6.
    Notes: Durch Abspaltung von Bromwasserstoff entstehen aus den trans-3.4-Dihalogen-chromanen die entsprechenden 4-Halogen-2H-chromene 1-4. Die 3-Brom-2H-chromene 5 und 6 erhält man durch Dehydratisierung der cis-3-Brom-4-hydroxy-chromane.
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  • 14
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 210-219 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vinylogous Acyl Compounds, IX. Hydrolysis of Vinylogous Carbonamidium SaltsThe hydrolysis of vinylogous carbonamidium salts 10 in aqueous sodium hydrogen carbonate solution does not lead - as hitherto supposed - to meso-(2-acylvinyl)acylacetaldehydes 8, but to bis(2-acylvinyl)ethers 11. The structure of these compounds results from n. m. r. and i. r. spectra and is confirmed by independent synthesis.
    Notes: Die Hydrolyse vinyloger Carbonamidiumsalze 10 in wäßriger Natriumhydrogencarbonat-Lösung führt nicht - wie bisher angenommen - zu meso-[2-Acyl-vinyl]-acylacetaldehyden 8, sondern zu Bis-[2-acyl-vinyl]-äthern 11. Die Strukturzuordnung dieser Verbindungen gründet sich auf NMR- und IR-spektroskopische Befunde sowie auf eine unabhängige synthese.
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  • 15
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 160-167 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1.2.3-Tricarbonyl Compounds, V. Hydrate-forming 1.2.3-Tricarbonyl Compounds as Dienophiles in Diels-Alder ReactionsThe 1.2.3-tricarbonyl compounds 5-8 react as dienophiles and add isoprene or 2.3-dimethylbuta-1.3-diene to yield the spiro-dihydropyranes 9-16. I.r., mass, and n.m.r. spectra are discussed.
    Notes: Cyclische 1.2.3-Tricarbonylverbindungen (vgl. 5-8) reagieren als Dienophile mit Isopren und 2.3-Dimethyl-butadien-(1.3) unter Bildung der Spiro-dihydropyrane 9-16. Die IR- und Massenspektren der Reaktionsprodukte sowie die NMR-Spektren von 9 und 10 werden diskutiert.
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  • 16
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 205-209 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Microbiological 11β-Hydroxylation of 3β-Hydroxy-5α.6α-epoxysteroidsSome 3β-Hydroxy-5α,6α-epoxysteroids are hydroxylated specifically in 11β-position without formation of by-products by the fungus Curvularia lunata.
    Notes: Eine Reihe von 3β-Hydroxy-5α.6α-epoxy-steroiden wird mit dem Pilz Curvularia lunata ohne Bildung von Nebenprodukten spezifisch in 11β-Stellung hydroxyliert.
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  • 17
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 248-258 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Isoquinolines, II. 3.3-Dialkyl-3.4-dihydroisoquinolines from Alkyl-aryl-cyclopropanesUnder the conditions of the Graf-Ritter reaction alkyl-aryl-cyclopropanes 8 react with nitriles 2 via dialkyl-benzyl-carbonium ions 1 to give 3.3-dialkyl-3.4-dihydroisoquinolines 3. The effect of the substituents R1, R2, and R3 in 8 on the reaction is discussed.
    Notes: Alkyl-aryl-cyclopropane 8 reagieren unter den Bedingungen der Graf-Ritter-Reaktion über Dialkyl-benzyl-carboniumionen 1 mit Nitrilen 2 zu 3.3-dialkylsubstituierten 3.4-Dihydroisochinolinen 3. Der Einfluß der Substituenten R1, R2 und R3 in 8 auf den Reaktionsverlauf wird besprochen.
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  • 18
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 270-278 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Aromatic Erythrina-Alkaloids, XVIII. Concerning the Existence of trans-ErythrinanesWolff-Kishner reduction of the 6α-bromo-ketolactam 2 affords, among other products, the 6β-hydroxyerythrinane-8-one 8. This is the first compound of the trans-erythrinane series.
    Notes: Bei der Wolff-Kishner-Reduktion des 6α-Brom-ketolactams 2 entsteht neben anderen Produkten auch das 6β-Hydroxy-erythrinanon-(8) 8, der erste Vertreter der trans-Erythrinan-Reihe.
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  • 19
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 320-332 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ionization of Organomagnesium Compounds, IV. Formation of Carbanions from Organomagnesium Compounds by Means of Hexamethyl-phosphortriamideStepwise addition of hexamethylphosphortriamide (HMPT) to the solutions of benzyl-like organomagnesium compounds in diethylether results in drastic changes which can be observed spectroscopically. First, the absorption maxima are shifted to longer wave lengths in an apparently continuous manner, until two equivalents of the strongly donating cosolvent have been added. Further addition of HMPT leads to ionization of the C—Mg-bonds. This can be seen from the development of new bands characteristic of the carbanions, as represented by the alkali metal derivatives.
    Notes: Der Zusatz von Hexamethylphosphorsäuretriamid (HMPT) zu den ätherischen Lösungen von benzylartigen Organomagnesium-Verbindungen führt zu drastischen, spektral beobachtbaren Veränderungen. Zunächst tritt eine scheinbar kontinuierliche Verschiebung der Absorptionsmaxima nach längeren Wellen ein, bis zwei Äquivalente des starken Donor-Solvens zugesetzt sind. Weitere Zugabe von HMPT führt zur Ionisation der C—Mg-Bindungen und Freisetzung der betreffenden Carbanionen, die sich durch das Aufkommen der (von den Alkalimetall-Verbindungen bekannten) Carbanion-Banden zu erkennen gibt.
    Additional Material: 4 Ill.
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  • 20
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 343-343 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 21
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 350-351 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 22
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 391-401 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photochemistry of Small Rings, 23. Carbenacyclopentadienes and Alkynes. - Photochemical Synthesis of Benzindenes and SpirocyclopropenesPhotolysis of phenyl-substituted diazocyclopentadienes 3 in alkynes leads via the intermediate carbenacyclopentadienes to the formation of 1H-benz[e]indenes 5. 5c was degraded to the known compound 3-phenyl-2.3-dihydro-1H-benz[e]indene (8). - On irradiation 3a, f in dimethyl acetylenedicarboxylate yield the spiro[2.4]heptatrienes 9 instead of 5. 9a was rearranged by further irradiation to the benz[e]indene 5f. - The mechanism of the benzindene formation is discussed.
    Notes: Die Photolyse phenyl-substituierter Diazo-cyclopentadiene 3 in Alkinen führt über die Carbena-cyclopentadiene zu 1H-Benz[e]indenen 5. 5c wurde zum bekannten 3-Phenyl-2.3-dihydro-1H-benz[e]inden (8) abgebaut. - Die Bestrahlung von 3a, f in Acetylendicarbonester ergab jedoch nicht 5, sondern die Spiro[2.4]heptatriene 9. 9a wird durch weitere Belichtung in das Benz[e]inden 5f umgelagert. - Der Mechanismus der Benzinden-Bildung wird diskutiert.
    Additional Material: 2 Tab.
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  • 23
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 421-428 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Michael Additions with Ethyl β-Arylacrylates: The Synthesis of 3-Aryl-2.2-bis(ethoxycarbonyl)-5-pyrrolidonesThe Michael reaction of ethyl β-arylacrylates with diethyl acetaminomalonate followed by cyclisation directly yielded the 3-aryl-2.2-bis(ethoxycarbonyl)-5-pyrrolidones (4).
    Notes: β-Aryl-acrylsäure-äthylester werden mit Acetamino-malonsäure-diäthylester nach Michael unter nachfolgender Cyclisierung direkt zu 3-Aryl-2.2-bis-äthoxycarbonyl-pyrrolidonen-(5) (4) umgesetzt.
    Additional Material: 3 Tab.
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  • 24
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 461-472 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Chalcogen Compounds Diphenyldithiophosphinato Complexes of Vanadium(III), Vanadium(IV) and Molybdenum(VI)The preparation and properties of the compounds [(C6H5)2PS2]2MoO2 (3), [(C6H5)2PS2]2-VO (4) and [(C6H5)2PS2]3 V (5) are described. Their vibrational and electronic spectra are reported. The parameters 10 Dq = 13 200/cm and B = 395/cm were calculated from the electronic spectrum of the vanadium(III) compound.
    Notes: Die Darstellung und Eigenschaften der Verbindungen [(C6H5)2PS2]2MoO2 (3), [(C6H5)2PS2]2-VO (4) und [(C6H5)2PS2]3 V (5) werden beschrieben. Die Schwingungs- und Elektronenspektren werden mitgeteilt und letztere mit der Kristallfeldtheorie interpretiert. Für die Vanadin(III)-Verbindung lassen sich aus den Übergängen ν1(3T1g→3T2g) und ν2(3T1g(F) → 3T1g(P)) die Werte für 10 Dq 13200/cm und B 395/cm berechnen.
    Additional Material: 5 Ill.
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  • 25
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 513-518 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Reaction of Boron-Nitrogen Compounds with Excited Carbon Atoms Generated in an ArcThe interaction of carbon vapor from a carbon are with dimethylaminoborane, (CH3)2N—BH2 (1), yields as the main reaction product (dimethylamino)methylborane, (CH3)2 N—BH—CH3 (3), which combines with the starting material to form the four-membered ring compound 5. Other compounds formed in this reaction are (dimethylamino)dimethylborane, (CH3)2N—B(CH3)2 (2), and dimethylaminborane, (CH3)2NH—BH3, as well as the previously unknown compound (CH3)2N—BH—O—BH—N(CH3)2 (6), which could be isolated.
    Notes: Die Reaktion von im Lichtbogen erzeugten Kohlenstoffatomen mit Dimethylaminoboran, (CH3)2N—BH2 (1), ergibt als Hauptreaktionsprodukt das Dimethylamino-methylboran, (CH3)2N—BH—CH3 (3), das sich mit dem Ausgangsmaterial zur Vierringverbindung 5 umsetzt. Weiterhin findet man Dimethylamino-dimethylboran, (CH3)2N—B(CH3)2 (2) und Dimethylamin-boran, (CH3)2NH—BH3. Schließlich kann die bisher noch nicht bekannte Verbindung (CH3)2N—BH—O—BH—N(CH3)2 (6) isoliert werden.
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  • 26
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 528-532 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Simple Pathway to Azide-Bridged Palladium and Platinum(II) ComplexesSalts of azide-bridged dimeric cations are prepared in quantitative yields by reaction of the monomeric diazido complexes (Ph3P)2 M(N3)2 with nitrosyl- or triethyloxonium salts, and diethyl sulfate, respectively.
    Notes: Salze der azidverbrückten dimeren Kationen entstehen in praktisch quantitativer Ausbeute durch Umsetzung der monomeren Diazidokomplexe (Ph3P)2 M(N3)2 mit Nitrosyl- oder Triäthyloxonium-Salzen bzw. mit Diäthylsulfat.
    Additional Material: 2 Tab.
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  • 27
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 558-576 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, LV. Intramolecular Hydrogen Bonding in (2.2-Dimethylhydrazino)boranesN. m. r. spectroscopic investigations on (2.2-dimethylhydrazino)boranes demonstrate the presence of intramolecular hydrogen bonds in these compounds, and this is further proved by comparison with isopropylaminoboranes. The planar configuration of B[NH—N(CH3)2]3 and B2[NH—N(CH3)2]4 is determined by this bonding. The N—H … N bond energy has been estimated as ∼2.5 kcal/mole from the temperature dependence of the n. m. r. spectra. Intermolecular association is indicated in the compounds R2B—NH—N(CH3)2. - The basicity towards the acid CDCl3 decreases in the isopropylaminoborane series for (2.2-dimethylhydrazino)boranes the series has been found confirming the effects of intramolecular hydrogen bonding.
    Notes: Kernresonanzspektroskopische Untersuchungen an (2.2-Dimethyl-hydrazino)-boranen belegen durch Vergleich mit Isopropylamino-boranen intramolekulare Wasserstoffbrückenbindungen. Diese sind insbesondere für B[NH—N(CH3)2]3 und B2[NH—N(CH3)2]4 konfigurationsbestimmend. Ihre Bindungsenergie beträgt ∼2.5 kcal/Mol. In R2B—NH—N(CH3)2 erfolgt Assoziation über intermolekulare N—H … N-Bindungen, die in Lösung leicht aufbrechen. - Basizitätsbestimmungen mit der Referenzsäure CDCl3 ergeben die Reihe für die Isopropylamino-borane, jedoch für die (2.2-Dimethyl-hydrazino)-borane in Übereinstimmung mit den durch intramolekulare Wasserstoffbrückenbindungen bewirkten Effekten.
    Additional Material: 2 Ill.
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  • 28
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 4-10 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Structure of Thioamides and their Derivatives, XI. N.M.R-Spectroscopic Studies and the Mechanism of Isomerization of Thioamide anionsIn the n. m. r. spectra of thioformamide anions 2 a larger trans long-range coupling constant is observed than in the spectra of the corresponding thioformamides 1. In spite of this spectral evidence indicating that 2 has the stronger partial double bond character, 2 isomerizes faster than 1. This suggests that isomerization proceeds via an inversion mechanism, an assumption which is verified by the steric effects of o-substituents in thioformanilide anions 4. On the other hand, in the case of thioformanilides 3 a rotation mechanism is observed.
    Notes: In den NMR-Spektren von Thioformamid-Anionen 2 wird eine größere trans-Fernkopplungskonstante als in den entsprechenden Thioformamiden 1 gefunden. Trotz des daraus zu folgernden größeren Doppelbindungscharakters wird bei 2 eine schnellere Isomerisierung als bei 1 beobachtet. Der dadurch nahegelegte Inversionsmechanismus wird durch den sterischen Einfluß von o-Substituenten in den Thioformanilid-Anionen 4 belegt, während für die Thioformanilide 3 ein Rotationsmechanismus gefunden wird.
    Additional Material: 3 Tab.
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  • 29
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 50-58 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloadditions with Carbodiimides, 1. Influences of Substituents in the Cycloaddition of Ketenes to CarbodiimidesCarbodiimides and ketenes yield 4-imino-2-azetidinones (1-14) in a cycloaddition reaction. Aliphatic carbodiimides show higher reactivity than aromatic carbodiimides. In mixed aliphatic-aromatic substituted carbodiimides, therefore, preferentially one of the C=N bonds undergoes reaction. The structures of the resulting compounds were confirmed by chemical transformations, i.r., and n.m.r. spectra.
    Notes: Carbodiimide gehen mit Ketenen Cycloadditionen zu 4-Imino-azetidinonen-(2) (1-14) ein. Aliphatisch substituierte Carbodiimide sind reaktiver als aromatisch substituierte. Bei aliphatisch-aromatisch substituierten Carbodiimiden gelingt es daher, bevorzugt eine der beiden C=N-Doppelbindungen zur Reaktion zu bringen. Die Konstitutionen der 4-Iminoazetidinone-(2) ergeben sich aus IR- und NMR-Spektren in Verbindung mit chemischen Umwandlungen.
    Additional Material: 4 Tab.
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  • 30
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 75-77 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Higher Ring Systems with the Structural Characteristics of the Diamond-type Lattice, 1. Enamine Formation and Ring Fusion in the Case of Bicyclo[3,3,1]nonane-3,7-dioneBicyclo[3.3.1]nonane-3.7-dione can be condensed with pyrrolidine to form 1.3-dipyrrolidino-2-oxaadamantane. From this system the mono- and bis-pyrrolidinoenamine of bicyclo[3.3.1]-nonane-3.7-dione (3,5) can be obtained. The reaction of the bis-enamine 3 with ethyl bromomethylacrylate leads to the pentacycle 4.
    Notes: Bicyclo[3.3.1]nonandion-(3.7) (1) kann mit Pyrrolidin zum 1.3-Dipyrrolidino-2-oxa-adamantan (2) kondensiert werden. Aus diesem System sind das Mono- und Bis-pyrrolidin-Enamin des Bicyclo[3.3.1]nonandions-(3.7) (3.5) erhältlich. Über das Bis-Enamin 3 kann mit α-Brom-methyl-acrylsäure-äthylester der Pentacyclus 4 auf gebaut werden.
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  • 31
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 92-109 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Copper(I)-diazabutadiene Halides1,4-Diazabuta-1,3-dienes react with cuprous halides to form strongly coloured, monomeric 1:1 adducts 2-11, 16-20, 24, 25, containing copper with threefold coordination. This coordination number determines the spectroscopic behaviour. While diazabutadiene complexes of other metals in low oxidation states show a long-wavelength absorption with strong metal-to-ligand CT character, in the copper complexes 2-11, 16-20, 24, 25 the metal terms are about equally important in the ground and excited state without showing the typical solvatochromism and the extremely high intensity of the chromogenic transition.
    Notes: 1.4-Diaza-butadiene-(1.3) bilden mit Kupfer(I)-halogeniden stark farbige, monomere 1:1-Komplexe 2-11, 16-20, 24, 25 mit dreifach koordiniertem Kupfer. Diese Koordination bestimmt das elektronenspektroskopische Verhalten. Während in Diazabutadien-Komplexen anderer Metalle in niedrigen Oxydationsstufen die längstwellige Absorption sehr starken Metall-Ligand-charge-transfer-Charakter hat, fehlt hier bei etwa gleich starker Beteiligung von Metalltermen im Grundzustand und angeregten Zustand die typische Solvatochromie und die extrem hohe Intensität des farbgebenden Übergangs.
    Additional Material: 6 Ill.
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  • 32
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 145-149 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and N.M.R. Spectra of Trimethyl(allylidene)- and -(benzylidene)phosphoraneThe title compounds (1 and 2) have been prepared in a pure state for the first time. Their 1H n. m. r. spectra could be completely analysed and the data obtained are taken as evidence for a delocalisation of the ylidic carbanionic charge into the π-system.
    Notes: Trimethyl-allyliden- und -benzyliden-phosphoran (1 und 2) wurden erstmals rein dargestellt. Die 1H-NMR-Spektren ließen sich vollständig analysieren und im Sinne einer Delokalisierung der negativen Ladung in das π-System deuten.
    Additional Material: 1 Tab.
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  • 33
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Organophosphorus CH-acidic Compounds with Schiff Bases in the Presence of Acid and Alkaline Catalysts, V. Reaction of Esters of Propylbenzylphosphinic Acid in the Presence of Sodium AmideThe reaction of esters 1 of propylbenzylphosphinic acid with Schiff bases 2 in the presence of sodium amide has been studied. In ether at -33° esters of (2-arylamino-1,2-diarylethyl)-propylphosphinic acids (3 and 4) are obtained in 20-81% yields. In ether at 10° and in liquid ammonia small amounts of trans-olefins (5) are formed along with the adducts 3 and 4 (the yields of which decrease). The reactivity of 1 is compared with that of the esters of benzyl-phosphonic acid, and the mechanism of the reaction of 1 with 2 is discussed.
    Notes: Bei der Umsetzung der Propyl-benzyl-phosphinsäureester 1 mit Schiffschen Basen 2 in Gegenwart von Natriumamid entstehen in Äther bei -33° Ester der [2-Arylamino-1.2-diaryläthyl]-propyl-phosphinsäuren (3 und 4) in 20-81 proz. Ausbeute. In Äther bei 10°, in geringem Umfang auch in flüssigem Ammoniak, bilden sich neben den verringert auftretenden Addukten 3 und 4 auch noch trans-Olefine (5). Die Reaktionsfähigkeit von 1 im Vergleich zu den Benzylphosphonsäureestern sowie der Mechanismus ihrer Umsetzung mit 2 werden diskutiert.
    Additional Material: 2 Tab.
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  • 34
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 220-227 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: cis- and trans-3.3′-Dimethoxy-5.5′-di-tert-butyldiphenoquinone-(4.4′)The two geometric isomers of 3.3′-dimethoxy-5.5′-di-tert-butyldiphenoquinone-(4.4′) (1) were isolated. The configurational assignment was made on the basis of n.m.r. spectra and the X-ray diffraction pattern from single crystals. The free enthalpy of activation for the cis/trans-isomerisation was determined. -p-Diphenoquinones with different substituents in both rings, which were needed as model compounds, could be prepared for the first time.
    Notes: Die beiden geometrischen Isomeren des 3.3′-Dimethoxy-5.5′-di-tert.-butyl-diphenochinons-(4.4′) (1) wurden isoliert. Die Konfigurationszuordnung gelang anhand der NMR-Spektren sowie von Einkristall-Röntgenaufnahmen. Die Freie Aktivierungsenthalpie der cis/trans-Isomerisierung wurde bestimmt. -p-Diphenochinone mit verschiedenen Substituenten in beiden Ringen, als Vergleichssubstanzen benötigt, konnten erstmals dargestellt werden.
    Additional Material: 2 Ill.
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  • 35
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 290-300 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reductive Rearrangements of the Retrobenzilic Acid Type Induced by Lewis Acids, VI. Crossing ExperimentsBy a series of crossing experiments the reductive retrobenzilic acid rearrangements of 5,5-diaryldithiohydantoins (1) and 4,4-diaryl-2-imidazoline-5-thiones (3), induced by aluminium chloride and yielding the corresponding 4,5-diaryl-4-imidazoline-2-thiones (2) and 4,5-diarylimidazoles (4), respectively, were shown to proceed intramolecularly.
    Notes: Durch eine Serie von Kreuzungsversuchen wird der intramolekulare Verlauf der durch Aluminiumchlorid ausgelösten reduktiven Retrobenzilsäure-Umlagerung von 5.5-Diaryl-dithiohydantoinen (1) und 4.4-Diaryl-Δ2-imidazolin-thionen-(5) (3) zu 4.5-Diaryl-Δ4-imidazolin-thionen-(2) (2) bzw. 4.5-Diaryl-imidazolen (4) erwiesen.
    Additional Material: 2 Tab.
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  • 36
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 348-349 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 37
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 353-359 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Are Absolute Asymmetric Photosyntheses Possible?The addition of carbenes, generated from diazoalkanes by circularly polarized light, to trimethylethylene (1) yielded optically inactive cyclopropanes. Attempts to obtain a chiral photochemical cyclodimerisation of cyclopent-1-en-3-one (4) or to reproduce two absolute asymmetric photosyntheses described earlier also failed. Thus such syntheses appear to be questionable.
    Notes: Mit zirkular polarisiertem Licht aus Diazoalkanen erzeugte Carbene lieferten bei der Reaktion mit Trimethyläthylen (1) optisch inaktive Cyclopropane. Ebenso negativ verliefen Versuche, eine chirale photochemische Cyclodimerisierung von Cyclopenten-(1)-on-(3) (4) zu erzielen oder zwei früher beschriebene absolute asymmetrische Photosynthesen zu reproduzieren. Die Möglichkeit derartiger Synthesen scheint damit in Frage gestellt.
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  • 38
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 360-364 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1:1-Complexes of Mercuric Halides with MethyldiphenylstibineThe complexes [HgX2·SbCH3(C6H5)2]2 mit X=Cl (5), Br (6), J (7) precipitated on combination of equimolar amounts of the components in methanol or acetone solution. Dimeric, halogen-bridged structures for these complexes have been derived from infrared spectra (300-33/cm). The ligand methyldiphenylstibine (4) has been obtained in 89% yield by reaction of dijodomethylstibine (3) with phenylmagnesium bromide.
    Notes: Die Komplexe [HgX2·SbCH3(C6H5)2]2 mit X=Cl (5), Br (6), J (7) fallen bei der Vereinigung äquimolarer Mengen der Komponenten in Methanol- oder Aceton-Lösung aus. Dimere, halogenverbrückte Strukturen dieser Komplexe werden aus Infrarotspektren (300-33/cm) abgeleitet. Der Ligand Methyldiphenylstibin (4) wird durch Reaktion von Dijodmethylstibin (3) mit Phenylmagnesiumbromid in 89 proz. Ausbeute erhalten.
    Additional Material: 2 Tab.
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  • 39
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 407-411 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of α-Halocarbonyl Compounds with the Guanidine System. II. Reaction of ω-Bromoacetophenone with Anilinoguanidineω-Bromoacetophenone reacts with anilinoguanidine to give 2-amino-1-anilino-4-phenylimidazole (1a). On treatment with boiling hydrochloric acid 1a undergoes benzidine-like rearrangement yielding 2-amino-4(5)-phenyl-5(4)-[p-aminophenyl]-imidazole (6).
    Notes: ω-Brom-acetophenon reagiert mit Anilino-guanidin zu 2-Amino-1-anilino-4-phenyl-imidazol (1a), das durch siedende Salzsäure benzidinartig in 2-Amino-4(5)-phenyl-5(4)-[p-amino-phenyl]-imidazol (6) umgelagert wird.
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  • 40
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 429-439 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Stereoselective Synthesis of cis-3-Aryl-2-ethoxycarbonyl-5-pyrrolidonescis-3-Aryl-2-ethoxycarbonyl-5-pyrrolidones (6) are obtainable from 3-aryl-2,2-bis(ethoxy-carbonyl)-5-pyrrol idones(1) via their dicarboxy-derivatives (3) or their half-esters (5) by moderate stereoselective decarboxylation.
    Notes: Aus 3-Aryl-2.2-bis-äthoxycarbonyl-pyrrolidonen-(5) (1) lassen sich über die Dicarboxy-Verbindungen (3) oder über die Halbester (5) durch mäßig stereoselektive Decarboxylierung cis-3-Aryl-2-äthoxycarbonyl-pyrrolidone-(5) (6) gewinnen.
    Additional Material: 6 Tab.
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  • 41
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 456-460 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Chemical Synthesis of 2.4-Dithiopyrimidine Nucleoside-5′-mono- and -polyphosphatesThe synthesis of 2-thiothymidine-5′-phosphate (3), 2.4-dithiothymidine-5′-triphosphate (8c), 2.4-dithiouridine-5′-diphosphate (7a), 2.4-dithioribothymidine-5′-diphosphate (7b), and 2.4-dithiouridine-5′-triphosphate (8a) is reported. The behaviour in paper chromatography and paper electrophoresis as well as the phosphate content have been used as criteria of the purity.
    Notes: 2-Thio-thymidin-5′-phosphat (3), 2.4-Dithio-thymidin-5′-triphosphat (8c), 2.4-Dithio-uridin-5′-diphosphat (7a), 2.4-Dithio-ribothymidin-5′-diphosphat (7b) und 2.4-Dithio-uridin-5′-triphosphat (8a) wurden synthetisiert. Als Reinheitskriterien dienen das Verhalten in Papierchromatographie sowie Papierelektrophorese und der Phosphatgehalt.
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  • 42
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 519-523 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: E.S.R. Investigation of the Dinaphtho[2.3-c:2′.3′-h]phenothiazinyl Radical8H-Dinaphtho[2.3-c : 2′.3′-h]phenothiazine (1), obtained by reaction of di-2-anthrylamine with sulfur, yields the stable free radical 4 by dehydrogenation. For the solid state a free radical content of 85% has been determined by e. s. r. Solutions of 4 gave a complex e. s. r. spectrum which is discussed in connection with Hückel calculations.
    Notes: Das aus 2.2′-Dianthrylamin durch Umsetzung mit Schwefel zugängliche 8H-Dinaphtho-[2.3-c: 2′.3′-h]phenothiazin (1) liefert bei der Dehydrierung das stabile freie Radikal 4. Der Radikalgehalt beträgt im Kristall nach ESR-Messungen 85%. Lösungen von 4 liefern ein linienreiches ESR-Spektrum, das im Zusammenhang mit Hückel-Rechnungen diskutiert wird.
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  • 43
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 544-548 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: SO3-Insertion into Organopentacarbonylrhenium(I) CompoundsThe hitherto unknown sulfonato complexes CH3SO3ReI(CO)5 (4), C6H5SO3ReI(CO)5 (5), and p-CH3—C6H4SO3ReI (CO)5 (6) are obtained according to equation (1) by insertion of SO3 into the metal-carbon bond of CH3Re(CO)5 (1), C6H5Re(CO)5 (2), and p-CH3—C6H4Re(CO)5 (3). The composition and the structure of these compounds result from 1H n. m. r., mass, and i. r. spectroscopic investigations.
    Notes: Durch Einschiebung von SO3 in die Metall-Kohlenstoff-Bindung von CH3Re(CO)5 (1), C6H5Re(CO)5 (2) und p-CH3—C6H4Re(CO)5 (3) gelingt gemäß Gl. (1) die Darstellung der noch unbekannten Sulfonato-Komplexe CH3SO3ReI(CO)5 (4), C6H5SO3ReI(CO)5 (5) und p-CH3—C6H4SO3ReI(CO)5 (6). Die Zusammensetzung und Struktur dieser Verbindungen wurde mit Hilfe von 1H-NMR-, massen- und IR-spektroskopischen Untersuchungen ermittelt.
    Additional Material: 2 Tab.
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  • 44
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 577-592 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organic Peroxides, IX. Preparation and Thermolysis of tert-Butyl α-Aryloxy- and α-ArylthioperacetatesEleven tert-butyl α-aryloxyperacetates and four tert-butyl α-arylthioperacetates were prepared and characterized by spectra and analyses. The products and rates of their thermolyses are explained by a homolytic fragmentation mechanism. The rates are predominantly influenced by a polar effect. This is supported by the observation of Hammett relations in both series (σ = -1.1 and -1.3).
    Notes: 11 α-Aryloxy-peressigsäure-tert.-butylester und 4 α-Arylmercapto-peressigsäure-tert.-butylester wurden synthetisiert und durch Spektren und Elementaranalysen charakterisiert. Die Thermolyse dieser Peroxide erfolgt durch homolytische Fragmentierung. Ihre Geschwindigkeit gehorcht in beiden Reihen der Hammett-Beziehung mit σ = -1.1 bzw. -1.3 und unterliegt somit einem polaren Effekt.
    Additional Material: 9 Tab.
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  • 45
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 653-660 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Preparation of Fluorocyclotriphosphazenes with Phosphazene Side ChainsFluorocyclotriphosphazenes with phosphazene side chains were prolonged by the alternating reactions of hexamethyldisilazane and phosphorus pentachloride (1-8). The compounds formed contain up to six alternating (PN) bonds. Reactions of heptamethyldisilazane and methylamine give 9 and 10. Substitution reactions with the higher ring compounds yield 11-14. The properties of these substances are described and their structures could be likely prooved on the basis of 31P and 19F n. m. r. investigations. The compounds are further characterized by analysis and i. r. spectra.
    Notes: Fluorcyclotriphosphazene mit Phosphazenseitenkette werden durch alternierende Reaktionen mit Hexamethyldisilazan und Phosphorpentachlorid verlängert (1-8). Dabei entstehen Verbindungen, die bis zu sechs alternierende (PN)-Bindungen enthalten (7, 8). Umsetzungen mit Heptamethyldisilazan und Methylamin ergeben 9 und 10. Substitutionen an höheren Ringverbindungen führen zu 11-14. Die Eigenschaften dieser Substanzen werden beschrieben und ihre Struktur durch 31P- und 19F-NMR-Untersuchungen wahrscheinlich gemacht. Die Verbindungen werden weiterhin durch Analysen und IR-Spektren charakterisiert.
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  • 46
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 661-664 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 47
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 677-678 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 48
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 683-685 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 49
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 691-695 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Degradation Mechanism of Polyphosphoric Acid EstersPhenyl and methyl polyphosphates were reacted with small amounts of phenol, the course of the degradation reactions being followed by 31P n. m. r. spectroscopy of the obtained reaction mixtures. The analysis reveal general rules for the nucleophilic degradation of polyphosphate esters.
    Notes: Polyphosphorsäure-phenylester und -methylester wurden mit kleinen, Mengen Phenol umgesetzt und der Gang der Abbaureaktionen mit Hilfe der 31P-Kernresonanzspektren der entstandenen Reaktionsgemische untersucht. Die Analyse ergibt allgemeine Regeln für den nucleophilen Abbau von Polyphosphorsäureestern.
    Additional Material: 2 Ill.
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  • 50
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 705-716 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Course of the Pyridylation of Indoles and Pyrrolinones with Pyridine and BenzoylchlorideA mixture of pyridine and benzoyl chloride forms an SE reagent whose reaction with indoles and pyrrolin-2-ones is investigated. Indoles are converted to dihydropyridylindoles, e. g. 1, or to pyridylindoles, e. g. 3, whereas pyrrolinones undergo aromatization to pyrroles, e. g. 6, 7 or 10, with elimination of the amide oxygen. Reaction mechanisms are proposed and confirmed by the isolation of intermediates.
    Notes: Ein Gemisch von Benzoylchlorid und Pyridin stellt ein SE-Reagenz dar. dessen Reaktion an Indolen und Pyrrolinonen-(2) untersucht wird. Mit Indolen bilden sich Dihydropyridylindole (z. B. 1) bzw. Pyridylindole (z. B. 3), während Pyrrolinone unter Eliminierung des Amid-Sauerstoffs zu Pyrrolderivaten wie 6, 7 oder 10 aromatisiert werden. Reaktionsmechanismen werden vorgeschlagen und an Zwischenprodukten belegt.
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  • 51
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 717-721 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organic Phosphorus Compounds, 68. Preparation and Properties of Tetrakis(diphenylphosphine)nickel(0)The title compound, 1, was prepared by reacting of diphenylphosphine with bis(π-allyl)nickel, tetrakis(triphenylphosphine)nickel(0) (2), nickel-powder, or nickel(II) bromide. The structure of 1 was elucidated by Zerewitinoff method, i. r. and n. m. r. spectra. The alkylation of metalated 1 was not successful.
    Notes: Die Titelsubstanz 1 wurde durch Einwirkung von Diphenylphosphin auf Bis-π-allyl-nickel, Tetrakis(triphenylphosphin)-nickel(0) (2), Nickelpulver oder Nickel(II)-bromid dargestellt. Ihre Struktur wurde durch Zerewitinoff-Bestimmung, IR- und NMR-Spektren abgesichert. Eine Alkylierung von metalliertem 1 gelang nicht.
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  • 52
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 734-738 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 1-Oxo-1.3.6.7-tetrahydro-5H-furo[3.4-b]pyrans and -thiopyransVarious 2-methyl-3-ethoxycarbonyl-5.6-dihydro-4H-pyrans and -thiopyrans (1) react with bromine to form the corresponding 2-bromomethyl derivatives (2), which can be converted by heating to α.β-unsaturated γ-lactones (3) l. r. and n. m. r. spectra are reported and discussed.
    Notes: Die Bromierung verschiedener 2-Methyl-3-äthoxycarbonyl-5.6-dihydro-4H-pyrane und -thiopyrane (1) führt zu den entsprechenden 2-Brommethylverbindungen (2), die thermisch zu α.β-ungesättigten γ-Lactonen (3) cyclisiert werden können. Die Strukturen werden durch NMR- und IR-Spektren bewiesen.
    Additional Material: 1 Ill.
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  • 53
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 722-733 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contribution to the Chemistry of Boron, LVI. Derivatives of HydrazinodiphenylboraneHydrazinodiphenylboranes of the type XNH—NH—B(C6H5)2 are monomeric (1a). The acyl derivatives (1b—d) (X = C6H5CO, CH3CO, (C6H5)2P(O)) are all internally coordinated through BO-bonds. -N.N′-Bis(diphenylboryl)derivatives of hydrazines (2a—c) are obtained from (C6H5)2BN(C2H5)2 and N2H4, CH3NH—NH2, or CH3NH—NHCH3 but no N.N′-bis-(diphenylboryl)hydrazines can be prepared by this method. Compounds of the latter type (3) are accessible via N-lithiohydrazines. - The structures of the new compounds are discussed and some of their chemical properties reported.
    Notes: Hydrazino-diphenylborane des Typs XNH—NH—B(C6H5)2 sind monomer (1a); in den N-Acyl-N′-diphenylboryl-hydrazinen (1b—d) (X = C6H5CO, CH3CO, (C6H5)2P(O)) liegt vierbindiges Bor vor. - N.N′-Bis-diphenylborylierung an Hydrazinen gelingt durch Einwirkung von (C6H5)2BN(C2H5)2 auf Hydrazin, Methylhydrazin und N.N′-Dimethyl-hydrazin (Bildung von 2a—c). Diese Umaminierung kann zur Darstellung von N.N′-Bis(diphenylboryl)-hydrazinen nicht herangezogen werden; sie (3) sind jedoch über mit LiCH3 metallierte Hydrazinderivate zugängig. - Die Strukturen der neuen Verbindungen werden diskutiert und einige ihrer chemischen Eigenschaften beschrieben.
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  • 54
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 739-747 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pteridines, XL. Synthesis of 3.N2.N2-TrimethylpterinsThe synthesis of 2-dimethylamino-3-methyl-4-oxo-3.4-dihydropteridines (18 and 19) is described. Comparisons of u. v. spectra reveal that the predominant tautomeric form of pterin (20) in solution possesses the 2-amino-4-oxo-3.4-dihydrostructure. Various alkylations of 4-aminopyrimidine derivatives are included in these investigations.
    Notes: Die Synthese von 2-Dimethylamino-4-oxo-3-methyl-3.4-dihydro-pteridinen (18 und 19) wird beschrieben. Durch UV-Spektrenvergleiche läßt sich zeigen, daß von den möglichen tautomeren Formen des Pterins (20) die 2-Amino-4-oxo-dihydro-Struktur in Lösung bevorzugt wird. Verschiedene Alkylierungen von 4-Amino-pyrimidin-Derivaten sind in die Untersuchungen mit einbezogen.
    Additional Material: 2 Ill.
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  • 55
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 787-791 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Investigation of Hydroacridines, VIII. Synthesis and Structure of 9-(4-Pyridyl)- and 9-(3-Pyridyl)-symm-octahydroacridineBy condensation of γ-and β-pyridinealdehyde with cyclohexanone, the tricyclic ketols 1 a and 1 b are obtained. Their oximes 2 give by thermal decomposition the corresponding 9-pyridyl-symm-octahydroacridines (3). The n. m. r. spectra are discussed.
    Notes: Durch Kondensation von γ-bzw, β-Pyridinaldehyd mit Cyclohexanon werden die tricyclischen Ketole 1 a und 1 b erhalten. Deren Oxime 2 ergeben durch thermische Zersetzung die entsprechenden 9-Pyridyl-symm-octahydroacridine (3). Die NMR-Spektren der dargestellten Verbindungen werden besprochen.
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  • 56
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 770-779 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pteridines, XLI. Synthesis of Pteridine-N-8-ribosides5-Nitro-4-(ribofuranosylamino) pyrimidines (1—4) are reduced to the corresponding 5-amino derivatives (5, 6) and these condensed with ethyl glyoxylate (7, 8). On subsequent ringclosure the pteridine-N-8-ribosides (9—12) are formed. U. v. and n.m.r. spectra are used for characterization.
    Notes: Zur Synthese der ersten Pteridin-N-8-riboside (9—12) werden 5-Nitro-4-ribofuranosylamino-pyrimidine (1—4) zunächst zu den 5-Aminoderivaten (5, 6) reduziert, diese dann mit Glyoxyl-säureester kondensiert (7, 8) und 7, 8 anschließend cyclisiert. Zur Charakterisierung der Produkte dienen UV- und NMR-Spektren.
    Additional Material: 2 Ill.
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  • 57
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 780-786 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pteridines, XLII. A New Pteridine Synthesis from 4.5-Dihalouracils and EthylenediaminesA new approach for the synthesis of pteridine derivatives from 4.5-dihalouracils and ethylenediamines is described. pK values and u. v. absorption spectra of the synthesized products have been determined.
    Notes: Eine neue Synthesemöglichkeit für Pteridin-Derivate besteht in der Umsetzung von 4.5-Dihalogen-uracilen mit Äthylendiamin-Derivaten. pK-Werte und UV-Spektren der synthetisierten Verbindungen werden angegeben.
    Additional Material: 2 Ill.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 792-801 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XV. Formation of Ketene Aminals and Enediamines by Reaction of Bis(dimethylamino)-tert-butoxymethane with AzinesThe reaction of bis(dimethylamino)-tert-butoxymethane (2) with azines of aromatic aldehydes (4, 8) affords ketene aminals (5). Diazomethanes (9, 10) are formed as intermediates. Aryldiazomethanes react with 2 to give a mixture of ketene aminals (5), trans-enediamines (6), and cis-enediamines (7). The reaction of 2 with bis(2-pyridylmethylene)- (4n), with difurfurylidenehydrazine (4o) or with the azines 8, obtained by treatment of aromatic aldehydes with diphenylmethylenehydrazine, yields only ketene aminals (5). The reaction mechanism is discussed.
    Notes: Bei der Umsetzung von Bis-dimethylamino-tert.-butyloxy-methan (2) (Aminal-tert.-butyl-ester) mit Azinen aromatischer Aldehyde (4, 8) entstehen Ketenaminale (5) und als Zwischenprodukte Diazomethane (9, 10, ). Von diesen reagieren die Aryldiazomethane mit 2, zu Gemischen aus Ketenaminalen (5), trans- (6) und cis-Endiaminen (7). Bis-[Pyridyl-(2)-methylen]-(4n) und Difurfurylidenhydrazin (4o) sowie die aus aromatischen Aldehyden und Diphenyl-methylen-hydrazin dargestellten Azine 8 ergeben mit 2 ausschließlich Ketenaminale (5). Der Reaktionsablauf wird diskutiert.
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  • 59
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 748-769 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies in the Pyrimidine Series, XXVI. A New Synthesis of 4-(Glycosylamino)-5-nitropyrimidinesFusion of some 4-amino-5-nitropyrimidines (1 4, 33, 36) with acylated D-ribose, D-glucose or acylated methylglycosides of D-ribofuranose, 2-deoxy-D-ribofuranose or L-arabinofuranose with an acidic catalyst produced the corresponding 5-nitro-4-(acylglycosylamino)pyrimidines (9-19 and others). In most cases both anomers were formed. which could be separated by preparative layer chromatography. The structure and configuration of the anomers were determined by u. v., n. m. r., and o. r. d. spectra. In the case of the ribofuranosides the thermodynamically more stable α-anomers were formed in larger amounts than the β-compounds. The influence of various catalysts and reaction conditions on the yield and the anomeric ratio was investigated.
    Notes: Die Schmelzkondensation verschiedener 5-Nitro-4-amino-pyrimidine (1—4, 33, 36) mit vollacylierter D-Ribose und D-Glucose sowie mit acylierten Methylglykosiden der D-Ribofuranose, 2-Desoxy-D-ribofuranose und L-Arabinofuranose zu den entsprechenden 5-Nitro-4-acylglykosylamino-pyrimidinen (9-19 und andere) wird beschrieben. Meist werden beide Anomere gebildet, die durch präparative Schichtchromatographie isoliert und mit Hilfe von UV-, NMR- und ORD-Spektren charakterisiert werden. Die Schmelzkondensation verläuft bei den angewandten Bedingungen unter thermodynamischer Steuerung. Im Falle der Ribofuranoside sind die α-Verbindungen stabiler als die β-Anomeren. Der Einfluß verschiedener Katalysatoren und Reaktionsbedingungen auf Ausbeute und Anomerenverhältnis wird untersucht.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 802-807 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Indole Derivatives, XV. The Boron Hydride Reduction of Boron Difluoride-β-Dicarbonyl Complexes1.3-Dicarbonyl compounds in the indole series (3, 12) have been specifically reduced to the corresponding unsaturated ketones (6, 14) by sodium boron hydride after formation of the boron difluoride complexes (5, 13).
    Notes: 1.3-Dicarbonylverbindungen der Indolreihe (3, 12) werden nach Überführung in Bordifluorid-Komplexe (5, 13) mit Natriumborhydrid glatt und einsinnig in α-β-ungesättigte Ketone (6, 14) übergeführt.
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  • 61
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 808-821 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermal Decomposition of Diarylnitrosamines and -nitraminesThermal decomposition of the nitrosamines 1 and 8 in the absence of oxygen affords diarylamine radicals which form 4-7 and 9-11, respectively. The results support the radical mechanism for the thermal benzidine rearrangement. - The nitramines 13, 14 and 17 undergo a thermal nitramine rearrangement. - Heating of 1 and 16 in the presence of oxygen to give 2, 3 and 19, 20, respectively, proceeds as depicted in eqn. (1).
    Notes: Die thermische Zersetzung der Nitrosamine 1 und 8 unter Sauerstoff-Ausschluß liefert Diarylamin-Radikale, die miteinander zu 4-7 bzw. 9-11 reagieren. Die Ergebnisse stützen den Radikalmechanismus für die thermische Benzidin-Umlagerung. - Die Nitramine 13, 14 und 17 gehen beim Erhitzen eine radikalisch ablaufende Nitramin-Umlagerung ein. - Für die Bildung von 2 und 3 bzw. 19 und 20 beim Erhitzen von 1 und 16 in Sauerstoff-Gegenwart wird der in Gl. (1) formulierte Reaktionsweg abgeleitet.
    Additional Material: 2 Tab.
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  • 62
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 822-829 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses with Substituted Malondialdehydes, X. γ-Fluoropentamethinecyanine DyesCondensation of substituted malondialdehydes 2 and 4 with heterocyclic imonium salts 1 yields pentamethinecyanine dyes 3 and 5 in which the polymethine chain is γ-substituted with fluorine and other groups. The introduction of fluorine causes a bathochromic (!) shift of the long wave length absorption band (table 1). - The influence of substituents on the long wave length absorption band of pentamethinecyanine dyes (table 2) is quantitatively described by means of a Hammett correlation (fig.), and the deviations are discussed. - σp-Constants for 4-nitrophenyl and 2-pyrazinyl are estimated.
    Notes: Durch Kondensation substituierter Malondialdehyde 2 und 4 mit heterocyclischen Imoniumsalzen 1 werden symmetrische Pentamethincyanin-Farbstoffe 3 und 5 dargestellt, deren Polymethin-Kette mit Fluor und anderen Gruppen γ-substituiert ist. Die Einführung des Fluors bewirkt eine bathochrome (!) Verschiebung der längstwelligen Absorptionsbande (Tab. 1). - Der Substituenteneinfluß auf die längstwellige Absorptionsbande von Pentamethincyanin-Farbstoffen (Tab. 2) wird durch eine Hammett-Korrelation quantitativ beschrieben (Abbild.), Abweichungen werden diskutiert. - σp-Werte für den 4-Nitrophenyl- und den Pyrazinyl-(2)-Rest werden abgeschätzt.
    Additional Material: 4 Tab.
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  • 63
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 861-872 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetramethoxyethylene, VI. Cycloadditions of Tetramethoxyethylene to Carbon SuboxideReaction of tetramethoxyethylene with carbon suboxide yields via the intermediary 1 : 1 cycloadduct 6 a 2 : 1-adduct 10 and a 2 : 2-adduct 19. The structural assignments rest on chemical reactions, spectroscopic data, and an X-ray analysis.
    Notes: Bei der Umsetzung von Tetramethoxy-äthylen (1) mit Kohlensuboxid (2) entstehen als Folgeprodukte des intermediär auftretenden 1 : 1-Adduktes 6 ein 2 : 1-Addukt 10 und ein 2 : 2-Addukt 19. Die Strukturzuordnung stützt sich auf Reaktionen, spektroskopische Daten und eine Röntgen-Strukturanalyse.
    Additional Material: 2 Ill.
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  • 64
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 830-836 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of 1.6-Anhydro-β-D-mannofuranose and 1.6-Anhydro-α-L-gulofuranoseVacuum pyrolysis of D-mannose yields 1.6-anhydro-β-D-mannopyranose besides 1.6-anhydro-β-D-mannofuranose (1a), which can be obtained in an overall yield of 3.3% by direct crystallisation. RuO4-Oxidation of the 2.3-O-isopropylidene derivative of 1 a leads to the formation of 1.6-anhydro-2.3-O-isopropylidene-β-D-lyxo-hexofuranos-5-ulose (3), which is reduced with LiAlH4 stereoselectively to the corresponding 1.6-anhydro-α-L-gulofuranose derivative 4.
    Notes: Durch Vakuumpyrolyse von D-Mannose ist neben 1.6-Anhydro-β-D-mannopyranose die 1.6-Anhydro-β-D-mannofuranose (1 a) direkt in 3.3 proz. Ausb. kristallisiert gewinnbar. RuO4-Oxydation der 2.3-Isopropyliden-Verbindung von 1 a ergibt 1.6-Anhydro-2.3-O-isopropyliden-β-D-lyxo-hexofuranos-5-ulose (3), die mit LiAlH4 selektiv zum 1.6-Anhydro-α-L-gulofuranose-Derivat 4 hydriert wird.
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  • 65
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 837-846 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polypodosaponin, a New Type of Saponin from Polypodium Vulgare L.From Polypodium vulgare L. a. saponin, polypodosaponin (1), was isolated. It is easily converted into 26-O-methyl-polypodosaponin (2) during the isolation with methanol. The structure elucidation was mainly made with 2. The corresponding aglykon (26-O-methylpolypodogenin) has been shown to have the structure of a 3β-hydroxy-26ξ-methoxy-22ξ.26ξ-epoxy-6-oxo-5α-cholest-7-ene (4). In the saponin 2, the 3β-hydroxy group is attached to an α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl moity. 2 shows the typical properties of a saponin, and it is representing a new type of steroid saponins.
    Notes: Aus Polypodium vulgare L. wurde ein Saponin, das Polypodosaponin (1), isoliert. Es geht bei der Isolierung mit Methanol leicht in das 26-O-Methyl-polypodosaponin (2) über, an dem vorwiegend die Konstitution aufgeklärt wurde. Dem zugehörigen Aglykon (26-O-Methyl-polypodogenin) konnte die Struktur eines 3β-Hydroxy-26ξ-methoxy-22ξ.26ξ-epoxy-6-oxo-5α-cholestens-(7) (4) zugeordnet werden. Im Saponin 2 ist die 3β-Hydroxygruppe an einen α-L-Rhamnopyranosyl-(1 -2)-β-D-glucopyranosyl-Rest gebunden. 2 besitzt typische Saponineigenschaften und stellt eine neue Variante der Steroidsaponine dar.
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  • 66
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 847-860 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Type and Energetic Height of the Lowest Triplet Level in Dihalomaleic AnhydridesDichloro-, dibromo- and diiodomaleic anhydrides show on excitation in the edge of the longest wavelength absorption band a phosphorescence emission, which, due to a photodissociation process, disappears on excitation with light of shorter wavelength. Triplet energy, singlet-triplet splitting as well as the phosphorescence lifetime of the anhydrides were measured. The emitting triplet term belongs obviously to a 3(ππ
    Notes: Dichlor-, Dibrom- und Dijodmaleinsäureanhydrid zeigen bei Anregung in der längstwelligen Absorptionskante eine Phosphoreszenz-Emission, die aufgrund eines Photodissoziationsprozesses bei der Einstrahlung kürzerwelliger Erregerstrahlung verschwindet. Triplettenergie, Singulett-Triplett-Aufspaltung sowie Phosphoreszenz-Lebensdauer der Derivate wurden bestimmt. Der emittierende Term gehört offensichtlich zu einer 3(ππAbkürzung für Maleinsäureanhydrid.)Configuration.
    Additional Material: 7 Ill.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 873-885 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetramethoxyethylene, VII. 2 + 2-Cycloadditions to TetramethoxyethyleneTetramethoxyethylene (1) readily adds to electrophilic unsaturated compounds to form 2 + 2-cycloadducts in high yield with retention of stereochemistry. Thermolyses and photolyses of some of the cycloadducts are reported.
    Notes: Tetramethoxy-äthylen (1) addiert sich in hohen Ausbeuten an elektrophile, ungesättigte Partner in einer stereospezifischen 2 + 2-Cycloaddition. Die Thermolyse und Photolyse einiger Addukte wird beschrieben.
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  • 68
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 886-894 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aminyls, 4. The Thermal Decomposition of p-Substituted TetraarylhydrazinesDepending on the nature of the p-substituent, the thermal decomposition of p-substituted tetraarylhydrazines yields diarylamin, o-semidine, m-Semidine, dihydrophenazine, as well as products of higher molecular weight.
    Notes: Abhängig von der Art des p-Substituenten werden bei der thermischen Zersetzung p-substituierter Tetraarylhydrazine Diarylamin, o-Semidin, m-Semidin, Dihydrophenazin und Produkte höheren Molekulargewichts gebildet.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 902-908 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Kinetic and Radical Efficiency for the Decomposition of Tertiary HyponitritesThe thermal decomposition of dicumylhyponitrite (1a) is a first order reaction with an activation enthalpy of 27.3 kcal/mole and an activation entropy of 8.5 e. u. in isooctane. The efficiency of radical formation is 84% for 1a but 92% for di-tert-butylhyponitrite. The rate constants for the decomposition of substituted dicumylhyponitrites follow the Hammett equation with σ=++0.34 by applying σ+ values.
    Notes: Der thermische Zerfall von Dicumylhyponitrit (1a) ist eine Reaktion erster Ordnung mit einer Aktivierungsenthalpie von 27.3 keal/Mol und einer Aktivierungsentropie von 8.5 cal/Mol·Grad in Isooctan. Die Radikalausbeute für 1a beträgt 84%, für Di-tert.-butylhyponitrit 92%. Die Zerfallskonstanten substituierter Dicumylhyponitrite gehorchen bei Verwendung der σ+-Werte der Hammett-Beziehung mit σ=+ +0.34.
    Additional Material: 5 Ill.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 895-901 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Decomposition of Tertiary HyponitritesDicumylhyponitrite (1a), substituted dicumylhyponitrites (1b—1f) (p-Br, p-Cl, p-CH3, m-CH3, p-CH3O), bis-(1.1-diphenylethyl)hyponitrite (1h) and bis-(1.1-dimethylpentyl)hyponitrite (1g) were synthesized. The tertiary hyponitrites decompose thermally already fast at 40°C into nitrogen and free tertiary alkoxy radicals which then react further to the corresponding alcohols and ketones. The relative reactivities of tert-butoxy and cumyloxy radicals in respect to hydrogenabstraction and β-scission were determined in various solvents; cumyloxy radicals tend much more to β-scission than the tert-butoxy radicals. The generated free alkoxy radicals are able to initiate polymerization and autoxidation reactions and can be trapped by stable radicals.
    Notes: Dicumylhyponitrit (1a), substituierte Dicumylhyponitrite (1b—1f) (p-Br, p-Cl, p-CH3, m-CH3, p-CH3O), Bis-[1.1-diphenyl-äthyl]-hyponitrit (1h) und Bis-[1.1-dimethyl-pentyl]-hyponitrit (1g) wurden dargestellt. Die tertiären Hyponitrite zerfallen bereits rasch bei-40 in Stickstoff und freie Alkoxyradikale, die dann zu den entsprechenden Alkoholen und Ketonen weiter reagieren. Die relativen Reaktivitäten von tert.-Butyloxy-und Cumyloxyradikalen hinsichtlich Wasserstoffabstraktion und β-Spaltung wurden für verschiedene Lösungsmittel bestimmt; Cumyloxyradikale neigen stärker zur β-Spaltung als tert-Butyloxyradikale. Die freien Alkoxyradikale können Polymerisations- und Autoxydationsreaktionen initiieren und mit stabilen freien Radikalen abgefangen werden.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 909-912 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigation of the Wittig's Hydrocarbon in Benzene Solution by Means of the Para-Orthohydrogen ConversionThe magnetic properties of Wittig's hydrocarbon in benzene solution was investigated by means of the para-orthohydrogen conversion. The fraction of paramagnetic molecules was determined to be 〈3% at 20 and about 5% at 65°.
    Notes: Mit Hilfe der Parawasserstoff-Methode wurde das magnetische Verhalten-des Wittigschen Kohlenwasserstoffs in benzolischer Lösung untersucht. Der Anteil an paramagnetischen Molekülen wurde bei 20° zu 3% und bei 65° zu ca. 5% bestimmt.
    Additional Material: 1 Tab.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 913-916 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Novel Reversible Pseudobase IsomerizationThe dications 4 and 5 are rearranged under basic conditions to give the bases 13 and 14, respectively, containing one 3-oxotetrahydroquinoline ring instead of the two indoline rings in 4 and 5, which are reformed in acidic solution. The Fischer base 15 may be oxidized directly to 13.
    Notes: Im Alkalischen lagern sich die Dikationen 4 und 5 zu den Basen 13 und 14 um, wobei einer der beiden Indolinringe zu einem 3-Oxo-tetrahydrochinolinring erweitert wird. Im sauren Medium werden 4 und 5 zurückgebildet. Die Fischer-Base 15 läßt sich direkt zu 13 oxydieren.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 917-923 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Compounds with Urotropin Structure, XLVIII1.1′-Azoxyadamantane (5), the N-(1-adamantyl)nitrones 6-8 as well as the hydroxylamines 9 and 10 were obtained by conversions starting with N-(1-adamantyl)hydroxylamine (3) and/or 1-nitrosoadamantane (4). 1.1′-Azoadamantane (14) was synthesized in good yield by treatment of 1-(bromoamino)adamantane (13) with potassium tert-butoxide. By the same method 2.2′-azoadamantane (18) was obtained.
    Notes: Ausgehend von N-[Adamantyl-(1)]-hydroxylamin (3) und/oder 1-Nitroso-adamantan (4) wurden 1.1-Azoxyadamantan (5), die N-[Adamantyl-(1)]-nitrone 6—8 sowie die Hydroxylamine 9 und 10 erhalten. Eine ergiebige Darstellungsmethode für 1.1′-Azoadamantan (14) wurde in der Umsetzung von 1-Bromamino-adamantan (13) mit Kalium-tert.-butylat gefunden. Nach der gleichen Methode wurde 2.2′-Azoadamantan (18) dargestellt.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 941-949 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photolysis of 3-Aryl-Substituted 3H-PyrazolesPhotolysis of 3-aryl substituted 3H-pyrazoles 1a-d proceeds via the valence isomeric diazoalkenes 2a-d to the cyclopropenes 4a-d which in further photochemical reactions isomerize to the corresponding indenes 5a-c, 6 and 7.
    Notes: Belichtung der 3-arylsubstituierten 3H-Pyrazole 1a-d führt über die valenzisomeren Diazoverbindungen 2a-d zu den Cyclopropenen 4a-d, die in photochemischen Folgereaktionen zu den Indenen 5a-c. 6 und 7 isomerisieren.
    Additional Material: 2 Ill.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 932-940 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XVII. Reactions of (Dimethylamino)alkoxyacetonitriles(Dimethylamino)alkoxyacetonitriles (1) react with alcohols to form transacetalisation products. Reaction of 1 with primary amines results in elimination of alcohol and HCN and formation of formamidines (2); reaction of 1 with secondary amines affords aminals of glyoxylonitriles (6, 7). 1 reacts with reactive aldehydes in a multiple-step process to yield the corresponding α-(dimethylamino)nitriles 8 or the corresponding acyloins 9.
    Notes: Dimethylamino-alkoxy-acetonitrile (1) reagieren mit Alkoholen unter Umacetalisierung, mit primären Aminen unter Alkohol- und HCN-Abspaltung zu Formamidinen (2) und mit sekundären Aminen zu Aminalen des Glyoxylsäurenitrils (6, 7). Mit reaktiven Aldehyden entstehen in einer Mehrstufenreaktion die entsprechenden α-Dimethylamino-nitrile 8 oder die entsprechenden Acyloine 9.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 924-931 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orthoamides, XVI. Syntheses of O. N- and N.N-Acetals of α-Keto Carbonitriles and IminoestersO.N-acetals of α-keto carbonitriles (1) are formed by the reaction of dimethylformamide dialkylacetals with acyl cyanides as well as by the reaction of adducts of dialkylformamide and dimethyl sulfate with sodium cyanide in water. The corresponding N.N-acetals (2) are produced by reaction of 1 with dimethylamine, by reaction of aminalester with acyl cyanide, or by treatment of tetramethylformamidinium methyl sulfate with sodium cyanide in water. N-Alkylcarboxamide dimethyl sulfate adducts (3) react with sodium cyanide in water to give the methyl ester of the corresponding N-alkylcarboximidic acid (5).
    Notes: O.N-Acetale der α-Keto-carbonsäurenitrile (1) entstehen aus Dimethylformamid-dialkyl-acetalen und Acylcyaniden sowie aus Dialkylformamid-Dimethylsulfat-Addukten und Natriumcyanid in Wasser. Die entsprechenden N.N-Acetale (2) entstehen aus 1 mit Dimethylamin bzw. aus Aminalester mit Acylcyaniden oder aus Tetramethylformamidinium-methylsulfat mit Natriumcyanid in Wasser. N-Monoalkylsubstituierte Säureamid-Dimethylsulfat-Addukte (3) bilden mit Natriumcyanid in Wasser N-Alkyl-iminoester (5).
    Additional Material: 2 Tab.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 950-953 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Trinitroazaadamantane Derivatives1.3.5-Trinitrobenzene is converted on reduction with sodium boron hydride or Grignard compounds and subsequent reaction with formaldehyde and an ammonium salt into 3.5.7-trinitro-l-azaadamantane (8a) and derivatives of this compound (8b-e, 12, 13).
    Notes: 1.3.5-Trinitro-benzol läßt sich durch Reduktion mit Natriumborhydrid oder Grignard-Verbindungen und anschließende Aminoalkylierung zu 3.5.7-Trinitro-l-aza-adamantan (8a) sowie Derivaten davon (8b-e, 12, 13) umsetzen.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 958-960 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 954-957 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polyacetylenic Compounds, 189. On the New Polyynes from Psilothonna tagetesThe species belonging to the tribe Senecioneae contains two new C11-polyyne hydrocarbons (1 and 4). The structures are elucidated by spectral data and confirmed by synthesis. Biogenetic relationships are discussed.
    Notes: Die zum Tribus Senecioneae gehörende Art enthält zwei neue C11-Polyin-Kohlenwasserstoffe (1 und 4). Die Strukturen werden durch ihre spektralen Daten sowie durch Synthese sicher-gestellt. Die biogenetischen Beziehungen werden diskutiert.
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 961-963 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 964-966 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 967-968 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 969-971 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 84
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 972-973 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 85
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971) 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 86
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Chalcogen Compounds. Thio Anions as Bidentate Ligands in Transition Metal Complexes: Preparation and Properties of Tetrathiotungstato Compounds of NiII, CoII and ZnIITransition metal thioanions with d°-configuration of the central atom form complexes with ions of the first transition series. The preparation, properties, magnetic moments and structure of the new ions [Ni(WS4)2]2-, [Co(WS4)2]2- and [Zn(WS4)2]2- are reported. The infrared and electronic spectra are assigned and discussed.
    Notes: Thio-Anionen der Übergangsmetalle mit d°-Konfiguration des Zentralatoms bilden mit Ionen der ersten Übergangsperiode Komplexe. Über die Darstellung, Eigenschaften, magnetischen Momente und Struktur der Ionen [Ni(WS4)2]2-, [Co(WS4)2]2- und [Zn(WS4)2]2- wird berichtet. Die IR- und Elektronenspektren werden zugeordnet und diskutiert.
    Additional Material: 4 Ill.
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  • 87
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 986-992 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stibine Pentacarbonyl Complexes of Chromium(O), Molybdenum(O) and Tungsten(O)Preparation, i.r., 1H-n.m.r. and mass spectra of the diamagnetic, sublimable, labile, yellow stibine pentacarbonyl complexes Cr(CO)5SbH3, Mo(CO)5SbH3, and W(CO)5SbH3 are reported. Properties of SbH3 as complex ligand are discussed by means of the CO force constants and relative abundance of ions and compared with those of AX3 (A = N, P, As; X = H, C6H5).
    Notes: Über Darstellung, IR- und 1H-NMR- sowie Massenspektren der diamagnetischen, sublimierbaren, labilen, gelben Stibin-pentacarbonyl-Komplexe Cr(CO)5SbH3, Mo(CO)5SbH3 und W(CO)5SbH3 wird berichtet. Die Eigenschaften von SbH3 als Komplexligand werden anhand der vCO-Kraftkonstanten und relativen Ionenintensitäten diskutiert und mit denen von AX3 (A = N, P, As; X = H, C6H5) verglichen.
    Additional Material: 6 Tab.
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  • 88
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Transformations of N-substituted 3-Aminopropionic Acids, VI. Preparation of 2-Aryl-3-benzamino-3.3-diphenylpropionic Acids and their Transformation into N-Benzoylazetidin-2-onesThe preparation of 2-aryl-3-benzamino-3.3-diphenylpropionic acids by aminoalkylation of arylacetic acid di-anions with N-benzoyldiphenylketimine in liq. ammonia is described. Electron-attracting substituents (chlorine, bromine) at the para position in the benzene nucleus of the starting phenylacetic acids increased and electron-donating groups (methyl-, methoxy-) at the same position decreased the yields of the corresponding 3-benzamino-propionic acids. In ortho position the former substituents decreased the yields whereas the latter prevented the reaction. This fact is explained by the difference in configuration of the corresponding di-anions. The synthesized 3-benzaminopropionic acids were converted into the corresponding N-benzoylazetidin-2-ones by refluxing in acetic anhydride.
    Notes: Bei der Darstellung von 3-Benzamino-3.3-diphenyl-2-aryl-propionsäuren durch Amino-alkylierung di-anionisierter Arylessigsäuren mit N-Benzoyl-diphenylketimin in flüssigem Ammoniak ergab sich, daß Elektronenakzeptoren (Chlor, Brom) in p-Stellung die Ausbeuten an den jeweiligen 3-Benzamino-propionsäuren erhöhen, Elektronendonatoren (Methyl-, Methoxylgruppen) in derselben Stellung hingegen sie herabsetzen. In o-Stellung setzen die erstgenannten Substituenten die Ausbeuten herab, die der zweiten Art verhindern den Reaktionsablauf. Diese Tatsache wird durch die unterschiedliche Konfiguration der jeweiligen Di-Anionen erklärt. Die anfallenden 3-Benzamino-propionsäuren wurden durch Erhitzen in Acetanhydrid in die jeweiligen N-benzoylierten Azetidinone-(2) übergeführt.
    Additional Material: 2 Tab.
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  • 89
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organometalphosphine Substituted Transition Metal Complexes, XII. Organometalphosphinepentacarbonylchromium(O), -molybdenum(O), and -tungsten(O) ComplexesThe reaction of hexacarbonylchromium with 1. tri(tert-butyl)phosphine, tris(trimethylsilyl)-, tris(trimethylgermyl)-, and tris(trimethylstannyl)phosphine as well as 2. with (trimethylsilyl)-diphenylphosphine, bis(trimethylsilyl)phenylphosphine, and bis(trimethylstannyl)phenyl-phosphine results in the elimination of one CO ligand and the formation of the corresponding organometalphosphinepentacarbonylchromium(O) complexes. In analogy to 1. hexacarbonyl molybdenum and hexacarbonyltungsten react with tri(tert-butyl)phosphine, tris(trimethylgermyl)phosphine, and tris(trimethylstannyl)phosphine to form the corresponding complexes. The i.r., u.v., 1H n.m.r., and 31P n.m.r. spectra are reported and discussed.
    Notes: Hexacarbonylchrom reagiert 1. mit Tri(tert.-butyl)-phosphin, Tris(trimethylsilyl)-, Tris(trimethylgermyl)- und Tris(trimethylstannyl)-phosphin sowie 2. mit Trimethylsilyl-diphenylphosphin, Bis(trimethylsilyl)-phenyl-phosphin und Bis(trimethylstannyl)-phenyl-phosphin unter Abspaltung eines CO-Liganden und Bildung entsprechender Organometallphosphin-pentacarbonyl-chrom(O)-Komplexe. Analog zu 1. reagieren Hexacarbonylmolybdän und Hexacarbonylwolfram mit Tri(tert.-butyl)-phosphin, Tris(trimethylgermyl)- und Tris(trimethylstannyl)-phosphin unter Bildung entsprechender Komplexe. Die Infrarot-, UV-, 1H-NMR- und 31P-NMR-Spektren werden mitgeteilt und diskutiert.
    Additional Material: 5 Tab.
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  • 90
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of N-(p-Acetoxyphenyl)-N′-phenyl-N-(trifluoroacetyl)hydrazine and Determination of its Structure by Mass SpectrometryTrifluoroacetylation of p-acetoxyhydrazobenzene yields a mixture of 2 and 3. The structures of 2 and 3 were determined by mass spectrometry.
    Notes: Durch Behandlung von p-Acetoxy-hydrazobenzol mit Trifluoressigsäureanhydrid erhält man ein Gemisch der Isomeren 2, und 3, deren Strukturzuordnung massenspektrometrisch erfolgte.
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  • 91
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1017-1024 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrogen-bonds, XII. Intramolecular Hydrogen Bonding in 1.2-, 2.3- and 1.8-Hydroxy-, Amino- and Nitro- Naphthalene DerivativesThe strength of intramolecular H-bonds is decreased in nitro-naphthols in the order 1.2, 2.3 and 1.8 as measured from the shifts of the OH-streching frequencies in the i.r. spectra. Among the amino-naphthols the OH—N-bond is strongest in the 1.8-derivative. The occurence of H-bonds in nitro-naphthylamines has been reinvestigated. The effects of geometry on the strength of intramolecular H-bonds are discussed.
    Notes: Gemessen an der langwelligen Verschiebung der OH-Bande in den IR-Spektren wird die intramolekulare H-Brücke bei Nitro-naphtholen in der Reihenfolge 1.2 〉 2.3 und 〉 1.8 immer schwächer; im Gegensatz dazu liegt bei den Amino-naphtholen im 1.8-Derivat die stärkste OH—N-Brücke vor. Die H-Brücken bei 2.3- und 1.8-Nitro-naphthylamin werden erneut untersucht und die geometrischen Voraussetzungen für die Festigkeit solcher H-Brükken besprochen.
    Additional Material: 2 Ill.
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  • 92
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1001-1016 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heteropolycyclic Compounds of the Triangulene-type, I. 8.12-Dihydro-4H-benzol[1.9]quinolizino[3.4.5.6.7-defg]acridine-4.8.12-trione and 5.9-Dihydroquino[3.2.1-de]acridine-5.9-dioneThe u.v. spectra of the title compounds 6 and 8 are compared with the spectra of similar polycyclic 9-acridone derivatives. With increasing conjugation of the system bathochromic shifts of the longest wavelength absorption bands of the acridone-like spectra appear. All corresponding protonated species absorb at longer wavelength, which points to the occurence of oxygen-protonated species of type 14. The exceptionally large bathochromic shift of the longest wavelength band of the diketone 8 corresponds to its non-planar structure, which impairs the resonance stabilisation of the electronic ground state.
    Notes: Die UV-Spektren der Titelverbindungen 6 und 8 werden mit den Spektren ähnlicher polycyclischer Acridon-(9)-Abkömmlinge verglichen. Mit zunehmender Erweiterung des Konjugationssystems treten bathochrome Verschiebungen der längstwelligen Absorptionsbanden der Acridon-ähnlichen Spektren auf. Die zugehörigen protonierten Spezies absorbieren durchweg bei längeren Wellen, was auf das Vorliegen sauerstoff-protonierter Spezies des Typs 14 hinweist. Die außergewöhnlich große bathochrome Verschiebung der längstwelligen Bande des Diketons 8 beruht auf seiner nicht-planaren Struktur, die die Mesomeriestabilisierung des elektronischen Grundzustandes beeinträchtigt.
    Additional Material: 2 Ill.
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  • 93
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1030-1034 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Simultaneous Action of Phosphines together with Carbon Tetrachloride on Ammonia (Derivatives), II. A Simple Synthesis of NitrilsA new method for the convenient preparation of nitrils by separation of water from carboxylic amides is reported. They are formed via a simultaneous action of triphenylphosphine, carbon-tetrachloride and triethylamine on carboxylic amides, thiocarboxylic amides react in the same way. The reaction mechanism will be discussed.
    Notes: Ein neues Verfahren zur bequemen Darstellung von Nitrilen beruht auf der gemeinsamen Einwirkung von Triphenylphosphin, Tetrachlorkohlenstoff und Triäthylamin auf Carbon-säureamide. Thiocarbonsäureamide reagieren analog. Der Reaktionsmechanismus wird diskutiert.
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  • 94
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1035-1042 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photochemistry of Aromatic Nitro Compounds, II. Photoinduced Intramolecular Ring Closure of o-Nitro-tert-butylbenzenePhotolysis of o-nitro-tert-butylbenzene (1) in methanol containing sodium hydroxide leads to formation of small amounts of hydroxyazocompound 2 and to a 66 % yield of 1-hydroxy-3.3-dimethyl-2(3H)-indolone (3a), the structure of which is confirmed spectroscopically and by reduction to the known 3.3-dimethyl-2(3H)-indolone (6). The mass spectrum of 3a is discussed.
    Notes: Die Photolyse von 2-Nitro-1-tert.-butyl-benzol (1) in methanolischer-Natronlauge liefert neben geringen Mengen der Hydroxyazoverbindung 2 in 66 proz. Ausbeute 1-Hydroxy-3.3-dimethyl-3H-indolon-(2) (3a), dessen Struktur spektroskopisch sowie durch Reduktion zum bekannten 3.3-Dimethyl-3H-indolon-(2) (6) gesichert wird. Das Massenspektrum von 3a wird diskutiert.
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  • 95
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1058-1071 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photochemistry of Aromatic Nitro Compounds, IV. The Products of Irradiation of 1.4-Di-tert-butyl-2-nitrobenzene in Aliphatic AminesUpon photolysis of the sterically hindered 1.4-di-tert-butyl-2-nitrobenzene (2) in diethyl- and triethylamine three competing processes are observed: 1. photoreduction by the solvent of the nitro group to the hydroxylamine and to a small extent to the amine, 2. intramolecular cyclisation to 1, a process which was previously observed as the sole reaction when 2 was irradiated in various other solvents, and 3. isomerisation of 2 into 2.5-di-tert-butylbenzo-quinone monoxime (20).
    Notes: Bei der Photolyse des sterisch gehinderten 2-Nitro-1.4-di-tert.-butyl-benzols (2) in Diäthyl-und Triäthylamin werden drei konkurrierende Prozesse beobachtet: 1. Photoreduktion der Nitrogruppe durch das Lösungsmittel zum Hydroxylamin und in geringem Umfang zum Amin, 2. Intramolekulare Cyclisierung zu 1, ein Prozeß, der vordem als einzige Reaktion von 2 bei Bestrahlung in verschiedenen anderen Lösungsmitteln beobachtet worden war und 3. die Isomerisierung von 2 zum 2.5-Di-tert.-butyl-benzochinon-monoxim (20).
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  • 96
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    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1043-1057 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photochemistry of Aromatic Nitro Compounds, III. On the Mechanism of Light-Induced Formation of 1-Hydroxy-3.3-dimethyl-2(3H)-indolones from o-Nitro-tert-butylbenzenesIrradiation of o-nitro-tert-butylbenzenes 1a-e followed by alkaline and oxidative workup affords 1-hydroxy-3.3-dimethyl-2(3H)-indolones 2a-e, whereas 4-amino-2-nitro-tert-butylbenzene (1f) is photostable. The photolysis of model compound 1b in several solvents is investigated. Spectroscopic data and the sensitisation by benzophenone suggest that the lowest triplet of 1b with n-π*-character is the reactive species. The quantum yield for the formation of product 2b from 1b is (1.2 ± 0.1) × 10-2 mmoles/mEinstein. A reaction mechanism accounting for all products found is suggested.
    Notes: Die Photolyse der o-Nitro-tert.-butylbenzole 1a-e liefert bei alkalisch-oxydativer Aufarbeitung die 1-Hydroxy-3.3-dimethyl-3H-indolone-(2) 2a-e, während 2-Nitro-4-amino-tert.-butylbenzol (1f) photostabil ist. Die Modellsubstanz 1b wird in verschiedenen Lösungs-mitteln belichtet. Spektroskopische Befunde und die Sensibilisierung durch Benzophenon legen nahe, daß der unterste angeregte Triplettzustand von 1b mit n-π*-Charakter für die Reaktion verantwortlich ist. Die Quantenausbeute für die Bildung des Produktes 2b aus 1b beträgt (1.2 ± 0.1) × 10-2m Mol/mEinstein. Ein Reaktionsmechanismus, der alle gefundenen Produkte berücksichtigt, wird vorgeschlagen.
    Additional Material: 2 Ill.
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  • 97
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1H N.M.R. Study of the Ring Inversion of a Monosubstituted Cyclohexane by Means of a Paramagnetic Lanthanide Ion in the Substituent: Triscyclopentadienyl-(cyclohexylisonitrile)-praseodymium(III)It has been demonstrated that the 1H n.m.r. spectrum of the new organometallic C6H11X-system (C5H5)3PrIIICNC6H11 (CNC6H11 = cyclohexyl isonitrile) is so favourably modified by the action of the paramagnetic PrIII-ion that variable-temperature n.m.r. measurements provide here a new direct way for effective conformational analyses. Whereas at room temperature rapid C6H11-ring inversion gives rise to seven discrete cyclohexyl-proton lines, a total of thirteen well-separated signals appears at - 70°C. The low temperature spectrum is consistent with the predictions for two slowly inverting conformers whose Pr—C ≡ N—CRing-arrangement is linear or only slightly bent. As is further expected the coalescence temperatures of corresponding proton pairs in the conformers are not equal. Since all paramagnetic C6H11-shifts can be interpreted in terms of pseudocontact interactions, a complete assignment of all signals was possible. The ΔG-value of the ring inversion was found to be 282 ± 15 cal/mole.
    Notes: Am Beispiel des neuen metallorganischen Komplexes (C5H5)3PrIIICNC6H11 = (CNC6H11 Cyclohexylisonitril) wird gezeigt, daß die Temperaturabhängigkeit des „paramagnetisch aufgefächerten“ 1H-NMR-Spektrums dieses C6H11X-Systems sehr vorteilhaft zu dessen direkter Konformationsanalyse herangezogen werden kann. Während bei Raumtemperatur im Sinne einer sehr raschen C6H11-Ringinversion sieben diskrete C6H11-Signale auftreten, sind bei - 70° deutlich sämtliche dreizehn mit dem Fall einer linearen oder nur ganz schwach gewinkelten Pr—C≡N—CRing-Gruppierung vereinbaren Signale erkennbar. Die Koaleszenztemperaturen korrespondierender Protonenpaare der zwei Konformeren fallen hier erwartungsgemäß nicht zusammen. Die „paramagnetischen Verschiebungen“ der C6H11-Protonen lassen sich praktisch allein auf sog. Pseudokontakt-Wechselwirkungen zurückführen, so daß eine vollständige Zuordnung aller Signale vorgenommen werden konnte. Der ΔG-Wert der Ringinversion ergibt sich zu 282 ± 15 cal/Mol.
    Additional Material: 3 Ill.
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  • 98
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1088-1103 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alkoxydiazenium Salts, VI. Reaction with Hydroxide Ions to trans-α-HydroxydialkyldiazenesAliphatic alkoxydiazenium salts 6 are converted to α-hydroxydialkyldiazenes 4 by reaction with hydroxide ion. This new class of compounds is shown by u.v. and i.r. spectra to possess trans-stereochemistry about the azo double bond with intramolecular hydrogen bonding. Further evidence for the functional group is obtained from esterification by acetic anhydride/pyridine to the azoester 8, whilst treatment of an ethereal solution of 4 with HCl gas yields the hydrochloride 7 of the isomeric acid hydrazide.
    Notes: Aliphatische Alkoxy-diazenium-Salze 6 werden im Wäßrigen Medium durch Hydroxyl-Ionen in α-Hydroxy-dialkyldiazene 4, umgewandelt. Die Struktur dieser neuen Verbindungsklasse, die trans-Anordnung der Substituenten an der Azogruppe und intramolekulare Wasserstoffbrücke, folgt aus UV- und IR-Spektren. Zum Nachweis der funktionellen Gruppe erhält man aus den Azo-alkoholen 4 mit Acetanhydrid/Pyridin glatt die Azo-ester 8, während beim Einleiten von HCl-Gas in die ätherische Lösung von 4 die Hydrochloride 7 der isomeren Säurehydrazide ausfallen.
    Additional Material: 3 Tab.
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  • 99
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1104-1117 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alkoxydiazenium Salts, VII. Elucidation of the Reaction Leading to trans-α-Hydroxydialkyldiazenes; Independent Synthesis of these CompoundsThe reaction of 2-Alkoxy-1.1-dialkyldiazenium tetrafluoroborates 1 with hydroxide ions yielding α-hydroxydialkyldiazenes 2 occurs via the free alkyldiazene 8 and the aldehyde 9 as intermediates which react with one another to give the α-hydroxydialkyldiazenes 2 or 11. In an independent synthesis, the alkyldiazene liberated from the azocarboxylic acid 12 reacts with aldehydes 10 to give either 2 or 11.
    Notes: Der Reaktionsmechanismus der Umwandlung von 2-Alkoxy-1.1-dialkyl-diazenium-tetra-fluoroboraten 1 durch Hydroxyl-Ionen in α-Hydroxy-dialkyldiazene 2 wird geklärt. Als Zwischenprodukte treten freies Alkyldiazen 8 und Aldehyd 9 auf, die sich zu den α-Hydroxy-dialkyldiazenen 2 oder 11 verbinden. In einer unabhängigen Synthese vereinigt sich das aus der Azocarbonsäure 12 freigesetzte Alkyldiazen 8a mit Aldehyden 10 ebenfalls zu 2 oder 11.
    Additional Material: 5 Ill.
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  • 100
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    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1118-1135 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alkoxydiazenium Salts, VIII. Reaction with Hydroxide Ions to cis-α-Hydroxydialkyldiazenes and their Consequent ProductsAcyclic alkoxydialkyldiazenium salts react with hydroxide ion to give only the trans-α-hydroxydialkyldiazenes 6. The non-isolable cis-isomers 7 can only be prepared in solution by irradiation of the trans-isomer 6. On the other hand cyclic alkoxydiazenium salts 15, 19, and 23 give cis-α-hydroxydialkyldiazenes 24-26, which are also non-isolable, directly on treatment with hydroxide ion. Certain cis-azoalcohols with seven-membered rings dimerize amazingly easily to 14-membered rings (36 and 37) with trans-azo double bonds. The structure of these rings with their unusual functional groups has been established.
    Notes: Acyclische Alkoxy-dialkyldiazenium-Salze reagieren mit Hydroxyl-Ionen nur zu trans-α-Hydroxy-dialkyldiazenen 6. Die nicht isolierbaren cis-Isomeren 7 entstehen aus 6 erst beim Belichten. Dagegen reagieren die cycloaliphatischen Alkoxy-diazenium-Salze 15, 19, 23 mit Hydroxyl-Ionen direkt zu den ebenfalls nicht isolierbaren cyclischen cis-α-Hydroxy-dialkyl-diazenen 24-26. Bei Vorliegen eines siebengliedrigen Ringes können diese cis-Azo-alkohole überraschend leicht zu 14 gliedrigen Ringen mit trans-Azogruppen dimerisieren (36, 37). Die Struktur dieser Ringe mit ihren ungewöhnlichen funktionellen Gruppen wird bewiesen.
    Additional Material: 6 Ill.
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