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  • 1
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, CIII. Über ein dimeres Diazastannaboretidin: Darstellung, dynamisches Verhalten und Molekülstruktur (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 3672-3681 
    Details
    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, CIII. A Dimeric Diazastannaboretidine: Preparation, Dynamic Behaviour, and Molecular Structure(CH3)2B-N(CH3)Li and SnCl2 yield unstable Sn[NCH3-B(CH3)2]2; however, the reaction of SnCl2 with (CH3)3Si-NLi-B(CH3)2 leads to the dimeric diazastannaboretidine 4b with elimination. of B(CH3)3. 4b shows fluctuating behaviour at 〉60°C. According to its X-ray structure, 4b possesses a tricyclic tub form structure built from three condensed four-membered rings.
    Notes: (CH3)2B-N(CH3)Li und SnCl2 liefern instabiles Sn[NCH3-B(CH3)2]2, während die Umsetzung von SnCl2 mit (CH3)3Si-NLi-B(CH3)2 unter B(CH3)3-Abspaltung zu dem dimeren Diazastannaboretidin 4b führt. Dieses System zeigt oberhalb von 60°C fluktuierendes Verhalten. Nach einer Röntgenstrukturanalyse besitzt 4b eine tricyclische, aus drei Vierringen bestehende Wannen-struktur.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791121115
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  • 2
    Electronic Resource
    Electronic Resource
    Kernresonanzspektroskopische Untersuchungen an Bor-Verbindungen, XVII. 17O-NMR-Studien an Organyloxyboranen, Organyloxydiboranen(4), Dioxaborolanen und Boroxinen (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 333-341 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NMR Studies of Boron Compounds, XVII. 17O NMR Studies on Organyloxyboranes, Organyloxydiboranes(4), Dioxaborolanes, and Boroxins17O chemical shifts of 30 boron-oxygen compounds containing tricoordinate boron atoms can be interpreted in terms of B - O(pp)π interaction. In consonance with other physical data a decrease in the π bond order is indicated by the δ17O data along the series (R2B)2O 〉 (RBO)3 〉 R2BOR 〉 RB(OR)2 〉 B(OR)3 (R either CH3 or C2H5). Natural abundance 17O NMR spectra are recorded by PFT NMR spectroscopy in relatively short time as “routine” measurements.
    Notes: Die 17O-chemischen Verschiebungen von 30 Bor-Sauerstoff-Verbindungen, die dreifach koordiniertes Bor enthalten, sind mit B - O(pp)π-Wechselwirkung zu interpretieren. In Übereinstimmung mit anderen physikalischen Daten legen die δ17O-Werte eine Abnahme der π-Bindungsordnung in der Reihe (R2B)2O 〉 (RBO)3 〉 R2BOR 〉 RB(OR)2 〉 B(OR)3 (R = CH3 oder C2H5) nahe. 17O-NMR-Spektren von Verbindungen mit natürlicher Isotopenhäufigkeit werden mittels PFT-NMR-Spektroskopie relativ rasch in „Routinemessungen“ erhalten.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130134
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  • 3
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, CIV. Neue Ringsysteme mit Dibor-Einheiten als Ringglieder: Dithiadisilaboracyclopentane, Dithiatriborolane und Dithiatetraborinane (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 342-357 
    Details
    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, CIV. New Ring Systems Containing Diboron Units: Dithiadisilaboracyclopentanes, Dithiatriborolanes, and DithiatetraborinanesThe pyridine-catalysed comproportionation between the cyclothiasilanes 1 or 4 and the dithiatetrasilacyclohexane 2 yields the dithiatrisilacyclopentane 3. 3 reacts with R2N(Cl)B - B(Cl)NR2 (5), and the R2Si - SiR2 group is specifically eliminated from 3 yielding the dithiasiladiboracyclopentane 6, which is also obtained from 5 and 1 or 4, respectively. Further action of 5 on 6 results in the dimethylamino derivative of a dithiatetraborinane (7). Moreover, a dithiadisilaboracyclopentane (8) results from the S2Si4 system 2 and phenylborane dichloride, and finally, a dithiatriborolane (10) is obtained from 6 and CH3B(SCH3)2. The new heterocyclic compounds were fully characterized chemically and spectroscopically. The X-ray structure analysis of 6 and 7 reveals nonplanar rings with short B — N bonds.
    Notes: Die mit Pyridin katalysierte Komproportionierung der Cyclothiasilane 1 und 4 mit dem Dithiatetrasilacyclohexan 2 liefert das Dithiatrisilacyclopentan 3. Dieses reagiert spezifisch mit R2N(Cl)B - B(Cl)NR2 (5) zu einem Dithiasiladiboracyclopentan (6), ebenfalls erhältlich aus 5 und 1 bzw. 4. Mit weiterem 5 setzt sich 6 zum Dimethylamino-Derivat eines Dithiatetraborinans (7) um. Ein Dithiadisilaboracyclopentan (8) entsteht aus dem S2Si4-System 2 und Phenylbordichlorid, ein Dithiatriborolan-Derivat (10) aus 6 und CH3B(SCH3)2. Die neuen Heterocyclen werden chemisch und spektroskopisch charakterisiert. Die Röntgenstrukturanalyse sicherte für 6 und 7 nichtplanare Ringsysteme mit kurzen B — N-Bindungen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130135
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  • 4
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, CV. (N-Lithiomethylamino)dimethylboran als Reagens zur Darstellung N-funktioneller Aminodimethylborane (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 728-738 
    Details
    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, CV. (N-Lithiomethylamino)dimethylborane as a Reagent for the Preparation of N-Functional AminodimethylboranesThe reagent (CH3)2 — N(CH3)Li (1) allows the synthesis of many borylaminoelement compounds such as (CH3)2B — NCH3 — BCH3 — N(CH3)2, (CH3)2Si[NCH3 — B(CH3)2]2, (CH3)2B - NCH3 — Si(CH3)2 — NCH3 — Si(CH3)2Br, (CH3)2B — NCH3 — P(CH3)2 or (CH3)2B — NCH3 — As(CH3)2. Multifunctional element halides cause the formation of a complex mixture of products, and this is in part due to cyclocondensation reactions of longer chain compounds.
    Notes: Das Reagens (CH3)2B — N(CH3)Li (1) ermöglicht die Synthese zahlreicher Borylaminoelement-Verbindungen wie (CH3)2B — NCH3 — BCH3 — N(CH3)2, (CH3)2Si[NCH3 — B(CH3)2]2, (CH3)2B — NCH3 — Si(CH3)2 — NCH3 — Si(CH3)2Br, (CH3)2B — NCH3 — P(CH3)2 oder (CH3)2B — NCH3 — As(CH3)2. Mit mehrfunktionellen Elementhalogeniden wird die Produktpalette komplexer, was auch auf Cyclokondensation der längerkettigen Verbindungen zurückzuführen ist.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130230
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  • 5
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, CVI. Quecksilber-(dimethylboryl)methylamide (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 791-794 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Contributions to the Chemistry of Boron, CVI. Mercury (Dimethylboryl)methylamidesThe volatile compounds Hg[NCH3 — B(CH3)2]2 and CH3Hg — NCH3 - B(CH3)2 have been prepared. They are stable up to 80°C and show no assoziation in solution or the gaseous phase either through Hg — N or B — N coordinative bonding.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130236
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  • 6
    Electronic Resource
    Electronic Resource
    Donor/Akzeptor-substituierte aromatische Systeme, I. Dicarbonyl (η5 -cyclopentadienyl) (1,2,3-triphenylcyclo-propenyl)eisen (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 218-233 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Donor/Acceptor Substituted Aromatic Systems, I. Dicarbonyl (η5 -cyclopentadienyl)(1,2,3-triphenylcyclopropenyl)ironDicarbonyl (η5 -cyclopentadienyl)(1,2,3-triphenylcyclopropenyl)iron (13), the structure of which has been determined by X-ray crystallography, is formed from triphenylcyclopropenylium tetra-fluoroborate or bromide and sodium dicarbonyl(cyclopentadienyl)ferrate. With bromine, iodine, tetrafluoroboric acid, trifluoroacetic acid, and triethyloxonium tetrafluoroborate 13 gives triphenylcyclopropenylium salts (12), with hydrogen halides 1,2-diphenylindene (23), with acyl chlorides in the presence of aluminium chloride 3-acyl-1,2-diphenylindenes (25), and with mercuric chlorides hexaphenylbicyclopropene 14. Irradiation of 13 leads to the (oxocyclobutenyl)iron complex 9e and triphenylcyclobutenone (28). Obviously, 13 does not display any properties of a cyclopropenyl anion.
    Notes: Dicarbonyl (η5 -cyclopentadienyl)1,2,3-triphenylcyclopropenyl)eisen (13), dessen Bindungsverhältnisse durch eine Röntgenstrukturanalyse gesichert wurden, entsteht aus Triphenylcyclo-propenylium-tetrafluoroborat oder -bromid und Natrium-dicarbonyl(cyclopentadienyl)ferrat. Mit Brom, Iod, Tetrafluoroborsäure, Trifluoressigsäure und Triethyloxonium-tetrafluoroborat entstehen aus 13 Triphenylcyclopropenylium-Salze (12), mit Halogenwasserstoffsäuren 1,2-Diphenylinden (23), mit Säurechloriden in Gegenwart von Aluminiumchlorid 3-Acyl-1,2-diphenylindene (25) und mit Quecksilberchlorid Hexaphenylbicyclopropen 14. Die UV-Bestrahlung von 13 ergibt einen (Oxocyclobutenyl)eisen-Komplex (9e) neben Triphenylcyclobutenon (28), Offensichtlich weist 13 keine Cyclopropenyl-Anion-Eigenschaften auf.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120120
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  • 7
    Electronic Resource
    Electronic Resource
    Boranate und Boranato-metallate. III. Boranatozinkate der Alkalimetalle (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 386 (1971), S. 73-86 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The reaction of zinc halides (ZnCl2, ZnBr2) or Zn(BH4)2 with LiBH4 or NaBH4 in ether or tetrahydrofurane yields LiZn(BH4)3, Li2Zn(BH4)4 or NaZn(BH4)3 respectively. The latter complex is also obtained by the reaction of NaZn(OCH3)3 or Na2Zn(OCH3)4 with diborane. Octakis(tetrahydridoborato)-trizincate K2Zn3(BH4)8 and BaZn3(BH4)8 are formed by treating Zn(BH4)2 with KBH4 or Ba(BH4)2.The 11B-nmr- and ir-spectra of the new complexes are recorded and discussed in terms of double hydrogen bridge bonding of BH4 groups to the central zinc atom.
    Notes: Die Umsetzung von Zinkhalogeniden (ZnCl2, ZnBr2) bzw. Zinkboranat (Zn(BH4)2) mit LiBH4 oder NaBH4 in Äther oder Tetrahydrofuran liefert LiZn(BH4)3, Li2Zn(BH4)4 bzw. NaZn(BH4)3. Natriumtriboranatozinkat fällt auch bei der Reaktion von NaZn(OCH3)3 oder Na2Zn(OCH3)4 mit Diboran an. KBH4 und Ba(BH4)2 reagieren mit Zn(BH4)2 zu den Octaboranatotrizinkaten K2Zn3(BH4)8 und BaZn3(BH4)8.Die 11B-Kernresonanz- und IR-Spektren der neuen Komplexverbindungen werden diskutiert. Danach sind die BH4-Gruppen über zwei Hybridwasserstoffatome an das Zinkatom gebunden.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713860109
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  • 8
    Electronic Resource
    Electronic Resource
    Amino-phosphane. VIII. Über ein Octaphenyltetraphosphornitridchlorid und ein Tetraphenyldiphosphin-N-diphenylphosphino-imid (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 349 (1967), S. 225-240 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The cleavage of hexamethyldisilazane by diphenylphosphorus chloride yields trimethylchlorosilane as well as [(C6H5)2P]2NH (1), [(C6H5)2P]3N. HCl (4), or [(C6H5)2P]4NCl (5), according to the reaction conditions. 1 and diphenylphosphorus chloride yield in the presence of triethylamine (C6H5)2P—P(C6H 5)2=N—P(C6H5)2 (6) which can also be obtained from 4 and triethylamine. The structure of 5 is shown by 31P—NMR studies to be an octaphenyl tetraphosphorus nitride chloride. 5 is most readily prepared from (C6H5)2PCl and (C6H5)2P—N[Si(CH3)3]2.
    Notes: Die Silazanspaltung von Hexamethyldisilazan durch Diphenylphosphorchlorid führt je nach den Reaktionsbedingungen zu Trimethylchlorsilan und [(C6H5)2P]2NH (1), [(C6H5)2P]3N · HCl (4) und [(C6H5)2P]4NCl (5). 1 setzt sich mit Diphenyl-phosphorchlorid in Gegenwart von Triäthylamin zu (C6H5)2P—P(C6H5)2 =N—P(C6H5)2 (6) um, das auch durch Deprotonierung von 4 entsteht. 5 besitzt die Struktur eines Octaphenyltetraphosphornitridchlorids und ist besonders leicht aus (C6H5)2PCl und (C6H5)2P—N[Si(CH3)3]2 erhältlich.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19673490502
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  • 9
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Amino-arsane. II. Einige Reaktionen des Tris(dimethylamino)-arsans As(NMe2)3 (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 330 (1964), S. 233-244 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on the reactivity of the As—N bond in As(NMe2)3 showed, that electrophilic reagents EX like HCl, PhCOCl, PhCH2Cl or Ph2BCl cleave the As—N bond readily: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm As}\left({{\rm NMe}_2} \right)_3 + {\rm n EX} \to \left({{\rm Me}_{\rm 2} {\rm N}} \right)_{3 - {\rm n}} {\rm AsX}_{\rm n} + {\rm nENMe}_{\rm 2} $$\end{document} Dimethylamino-arsenic halides are also formed by mixing As(NMe2)3 with arsenic halides. These are useful intermediates in the preparation of organo-dimethylamino-arsanes, RnAs(NMe2)3-n.The formation of tris(dimethylamino)-arsonium salts from As(NMe2)3 is not very pronounced, only Br2 or Me2NCl are added yielding [(Me2N)3AsBr]Br and [(Me2N)4As]Cl respectively, but BrCN cleaves the As—N bond.Also the reactions of As(NMe2)3 with Ni(CO)4 and CS2 are reported.
    Notes: Elektrophile Agenzien EX, wie HCl, PhCOCl, PhCH2Cl oder Ph2BCl spalten die As—N-Bindungen des Tris(dimethylamino)-arsans As(NMe2)3 \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm As}\left({{\rm NMe}_2} \right)_3 + {\rm n EX} \to \left({{\rm Me}_{\rm 2} {\rm N}} \right)_{3 - {\rm n}} {\rm AsX}_{\rm n} + {\rm nENMe}_{\rm 2} $$\end{document} unter Bildung von Dimethylamino-halogen-arsanen. Diese sind besonders leicht durch Komproportionierung von As(NMe2)3 mit Arsenhalogeniden gewinnbar und stellen wertvolle Zwischenprodukte zur Synthese von Organyl-dimethylamino-arsanen RnAs(NMe2)3-n dar.Das Tris(dimethylamino)-arsan neigt nur wenig zur Bildung von Tris(dimethylamino)-arsoniumsalzen. Mit Brom ist ein [(Me2N)3AsBr]Br, mit Me2NCl ein [(Me2N)4As]Cl zu gewinnen. BrCN hingegen spaltet die As—N-Bindung.Über die Reaktionen des As(NMe2)3 mit Ni(CO)4 und CS2 wird berichtet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19643300502
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  • 10
    Electronic Resource
    Electronic Resource
    Boranate und Boranato-metallate. I. Zur Kenntnis von Solvaten des Zinkboranats (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 370 (1969), S. 209-223 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Several methods for the preparation of zinc tetrahydridoborate are discussed. Pure products are obtained by treating zinc methoxide with diborane in the presence of ether or tetrahydrofurane (THF). Association of Zn(BH4)2 in THF is established by electrical conductivity and transference number measurements.Zinc tetrahydridoborate resembles zinc bromide in its behaviour towards neutral donor molecules. Complexes of type Zn(BH4)2 · 2 D (D = THF, NC5H5, N(CH3)3) contain covalently bonded BH4- groups, while BH4-ions are present in Zn(BH4)2 · 4 D (D = NH3 and NH2CH3) which are best represented by the formula [ZnD4](BH4)2.
    Notes: Die Darstellung von Zinkboranat, Zn(BH4)2, nach der Diboran-Zinkmethoxid-Reaktion liefert in Gegenwart von Äther oder Tetrahydrofuran (THF) die reinsten Präparate. Elektrochemische Untersuchungen an Zn(BH4)2-Lösungen in THF beweisen den autokomplexen Charakter von Zn(BH4)2.Mit Neutralbasen reagiert Zn(BH4)2 wie Zinkbromid. Verbindungen des Typs Zn(BH4)2 · 2 D (D = THF, NC5H5, N(CH3)3) enthalten kovalent gebundene BH4- Gruppen, während Verbindungen des Typs Zn(BH4)2 · 4 D (D = NH3 und NH2) als [ZnD4](BH4)2 zu formulieren sind.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693700502
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