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  • 1
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Wasserabspaltung aus Linalool (1960)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 93 (1960), S. 974-978 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mit Hilfe der Dien-Synthese konnte gezeigt werden, daß, entgegen den bisherigen Beobachtungen, bei der Dehydratation von Linalool neben Myrcen zu etwa 40% Ocimen gebildet wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19600930431
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchungen über Heterocarbene, VIII. Synthese von Cyclopropanolen über [β-Chlor-äthyl]-cyclopropyl-äther (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 3391-3401 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: [β-Chlor-äthyl]-cyclopropyl-äther (8-19) werden aus Olefnen, Dichlormethyl-[β-chloräthyl]-äther (1) und Methyllithium · Lithiumjodid synthetisiert und in Cyclopropanole (23-32) übergeführt. Diese sind auch aus Cyclopropyl-phenyl-äthern und aus β-Brom-aldehyden herstellbar.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660991102
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  • 3
    Electronic Resource
    Electronic Resource
    Zum Mechanismus der Fritsch-Buttenberg-Wiechell-Umlagerung. Stereochemie der Thermolyse von Kalium-2-chlor-3.3-diaryl-acrylaten und lithiierter 1-Chlor-2.2-diaryl-äthylene3) (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 1674-1682 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mechanism of the Fritsch-Buttenberg-Wiechell Rearrangement.  -  The Stereochemistry of the Thermolysis of Potassium 3.3-Diaryl-2-chloroacrylates and of Lithiated 2.2-Diaryl-1-chloroethylenes3)The α-fragmentation of the stereoisomeric potassium 3-(4-biphenylyl)-2-chloro-3-phenyl-[2-14C]acrylates (10) at 160-190° in HMPT, and the thermolysis of the corresponding carbenoids, 2-(4-biphenylyl)-1-chloro-2-phenylvinyllithium (8), into (4-biphenylyl)phenyl-acetylene at low temperature both proceed stereospecifically with migration of the aryl substituent in trans-position of the halogen atom. The „trans-selectivity“ is lower for the acrylates (81% for trans- 10, 77% for cis-10) than for the carbenoids (97% for trans-84), 95% for cis-8). An „apparent cis-rearrangement“, consisting in the stereoisomerization of the halocarbanion intermediate 2 with a consecutive trans-migration, is excluded for the α-fragmentation by experimental evidence. In conclusion, a „true cis-rearrangement“ is postulated, which, like the trans-rearrangement, either starts at a late stage of the C-halogen bond breaking or after the formation of the carbene salt complex 22.
    Notes: Die α-Fragmentierung der stereoisomeren Kalium-2-chlor-3-phenyl-3-[biphenylyl-(4)]-[2-14C]-acrylate (10) bei 160-190° in HMPT zu Phenyl-[biphenylyl-(4)]-acetylen (11) vollzieht sich ebenso wie die Thermolyse der strukturanalogen Carbenoide, 1-Chlor-2-phenyl-2-[biphenylyl-(4)]-vinyllithium (8), bei tiefer Temperatur stereospezifisch unter Wanderung der zum Halogen trans-ständigen Arylgruppe. Bei den Acrylaten ist die „trans-Selektivität“ (81% bei trans-10, 77% bei cis-10) geringer als bei den Carbenoiden (97% bei trans-84), 95% bei cis-8). Für den cis-spezifischen Anteil der α-Fragmentierung wird eine Stereoisomerisierung am intermediären Halogencarbanion 2 experimentell ausgeschlossen und daher eine „wahre cis-Umlagerung“ postuliert, die wie die trans-Umlagerung entweder im Spätstadium der Halogenablösung vom α-Kohlenstoff oder am Carben-Salzkomplex 22 einsetzt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050523
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  • 4
    Electronic Resource
    Electronic Resource
    Polycyclische Verbindungen, IV. Darstellung von Hexahydrochrysen-Derivaten (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3340-3352 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polycyclic Compounds, IV. Synthesis of Hexahydrochrysene DerivativesA one-step synthesis of the hexahydrochrysenes 3 by Diels-Alder reaction of the 1,2-dehydronaphthalenes 1 with the tetrahydrobenzo[b]furanes 2 is described. In some cases the benzo[c]-phenanthrenes 4 are isolated as by-products. The methylenation of the oxanorbornadienedouble bond of 3c leads to the cyclopropane 6.
    Notes: Eine Einstufendarstellung der Hexahydrochrysene 3 durch Diels-Alder-Reaktion der 1,2-Dehydronaphthaline 1 mit den Tetrahydrobenzo[b]furanen 2 wird beschrieben. In einigen Fällen erhält man die Benzo[c]phenanthrene 4 als Nebenprodukte. Durch Methylenierung der Oxanorbornadien-Doppelbindung von 3c gelangt man zum Cyclopropan 6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741071020
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  • 5
    Electronic Resource
    Electronic Resource
    Über die chromatographische Spaltung von Racematen, IV. Camphersulfonsäuren, Diphensäuren und Aminosäuren (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1341-1346 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N-Acylierte DL-Aminosäuren lassen sich durch Chromatographie an Stärke um so besser optisch aktivieren, je größer der Ayclrest ist. Racem. Derivate des Camphers (3-Brom-DL-campher-sulfonsäure-(71) und DL-Campher-sulfonsäure-(11)) und racem. Diphensäure-derivate lassen sich ebenfalls um so besser trennen, je größer die Asymmetrie der Molekel ist. Optisch reine Fraktionen konnten erhalten werden von 3-Brom-DL-campher-sulfonsäure-(71), 6.6′-Dinitro-diphensäure und 4.6.4′.6′-Tetranitro-diphensäure.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990442
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  • 6
    Electronic Resource
    Electronic Resource
    Polycyclische Verbindungen, V. Benzologe Cyclohexadien-1,2-diol-Derivate aus Acyloxanorbornadienen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3353-3363 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polycyclic Compounds, V. Benzologous Cyclohexadiene-1,2-diol Derivatives from AcyloxanorbornadienesThe synthesis of the tetracyclic cyclohexadiene-1,2-diol derivatives 2 and 8 by reaction of the acyloxanorbornadienes 1 and 7 with water or alcohols in the presence of traces of mineral acid is described. For 2a and 2d the cis-configuration at C-11 and C-12 was proved.
    Notes: Die Synthese der tetracyclischen Cyclohexadien-1,2-diol-Derivate 2 und 8 durch Umsetzung der Acyloxanorbornadiene 1 und 7 mit Wasser oder Alkoholen in Gegenwart von wenig Mineralsäure wird beschrieben. Für 2a und 2d konnte die cis-Konfiguration an C-11 und C-12 bewiesen werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741071021
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  • 7
    Electronic Resource
    Electronic Resource
    Photofragmentation of Dibenzyl Ketone in the Presence of Tetramethylpiperidine Derivatives. Studies on light stabilizer mechanisms [1] (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 132-147 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The interaction of selected tetramethylpiperidine derivatives with radicals arising from the Norrish-type I cleavage of dibenzyl ketone under oxygen was studied. Product analyses and kinetic studies showed that the investigated sterically hindered piperidine derivatives have a pronounced effect on both the nature and distribution of the products of photolysis of dibenzyl ketone in the presence of oxygen. Observations indicated that the phenylperacetoxyl radical is formed as an intermediate during irradiation and that it interacts with the additives used. Possible mechanisms of the reactions studied are discussed.The observation that oxidation of an isolated double bond by the radicals formed in dibenzyl ketone photolysis under oxygen is strongly inhibited in the presence of the studied sterically hindered amines is discussed in the light of the results presented. The findings are considered in relation to the problem of polymer stabilization.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19800630114
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of Pure Al35Cl3 and Al37Cl3 (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 2375-2379 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chemically and isotopically pure Al35Cl3 and Al37Cl3 are synthesized from Al (s) and HCl (g). The yield is quantitative and no measurable decrease in isotopic content from HCl to AlCl3 takes place.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19800630829
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  • 9
    Electronic Resource
    Electronic Resource
    Enrichment of Potassium Isotopes with Macrocyclic Polyether Potassium Complexes (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 1687-1693 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enrichment of the potassium isotopes is achieved by means of the chemical exchange reaction \documentclass{article}\pagestyle{empty}\begin{document}$$ ^{41} {\rm K}^{\rm + } + ^{39} {\rm KL}^{\rm + } \mathbin{\lower.3ex\hbox{$\buildrel\textstyle\longrightarrow\over{\smash{\longleftarrow}\vphantom{_{\vbox to.5ex{\vss}}}}$}} ^{39} {\rm K}^{\rm + } + ^{41} {\rm KL}^{\rm + } $$\end{document} Where L represents a macrocyclic polyether. Dicyclohexyl-18-crown-6 ((cis-syn-cis)-isomer) was investigated. The single stage-separation factor a=1+ε was determined according to the method of Glueckauf from the elution curve and iso-topic assays. One obtains ε-values of 1.18, 0.84. and 0.74 × 10-3(±5×10-5) at -10, 0 and 10° respectively, in favor of the heavy isotope, indicating an enthalpy of isotopic exchange of -13 ± 4 Joule mol-1.The technical feasibility of a pre-enrichment process for 40K starling with basic laboratory data is discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650602
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  • 10
    Electronic Resource
    Electronic Resource
    Vinylkationen, 37. Umlagerungen cyclischer Homopropargylsulfonate zu kondensierten Cyclobutanonen und Cyclopropylketonen (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 1467-1487 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vinyl Cations, 37. Rearrangement of Cyclic Homopropargyl Sulfonates to Condensed Cyclobutanones and Cyclopropyl KetonesCyclic homopropargyl sulfonates 8 (tosylates, triflates, nonaflates, and damsylates) are prepared and solvolysed. The resulting rearrangement reactions are studied with respect to the properties of the solvents used, leaving groups, the substituent on the triple bond, and with respect to the ring size of the sulfonates 8.
    Notes: Cyclische Homopropargylsulfonate 8 (Tosylate, Triflate, Nonaflate und Damsylate) werden dargestellt und solvolysiert. Die dabei auftretenden Umlagerungsreaktionen werden in Abhängigkeit von den Eigenschaften der verwendeten Lösungsmittel, von der Abgangsgruppe, von den Substituenten an der Dreifachbindung und in Abhängigkeit von der Ringgröße der Sulfonate 8 untersucht.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150425
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