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  • 1
    Electronic Resource
    Electronic Resource
    Stabile Carbeniumionen, 27. DiarylchlorcarbeniumionenHerrn Prof. Dr. G. Pfleiderer zum 60. Geburtstag gewidmet. (1981)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 1415-1418 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stable Carbenium Ions, 271). - Diarylchlorocarbenium IonsDiarylchlorocarbenium hexachloroantimonates have been prepared as crystalline salts and are characterised.
    Notes: Diarylchlorcarbenium-hexachloroantimonate werden als kristalline Salze dargestellt und charakterisiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198119810810
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  • 2
    Electronic Resource
    Electronic Resource
    Stabile Carbeniumionen, 28. α,α′-Dihalogen-α,α′-diphenyl-m-phenylendicarbeniumionenHerrn Prof. Dr. G. Fritz zum 60. Geburtstag gewidmet. (1981)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 1419-1423 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stable Carbenium Ions, 281). - α,α′-Dihalogen-α,α′-diphenyl-m-phenylenedicarbenium Ionsα,α′-Difluoro-α,α′-diphenyl-m-phenylenedicarbenium hexafluoroantimonate and α,α′-dichloro-α,α′-diphenyl-m-phenylenedicarbenium hexachloroantimonate are prepared as crystalline salts and are characterised.
    Notes: α,α′-Difluor-α,α′-diphenyl-m-phenylendicarbenium-hexafluoroantimonat und α,α′-Dichlor-α,α′-diphenyl-m-phenylendicarbenium-hexachloroantimonat werden als kristalline Salze dargestellt und charakterisiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198119810811
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  • 3
    Electronic Resource
    Electronic Resource
    Stabile Carbeniumionen, 26. Diarylfluorcarbeniumionen - 19F-NMR-spektroskopische Ermittlung von Substituenteneffekten in p-substituierten Diaryl-carbeniumionenHerrn Prof. Dr. Th. Wieland zum 65. Geburtstag gewidmet. (1981)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 1407-1414 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stable Carbenium Ions, 261). - Diarylfluorocarbenium Ions - 19F-NMR-spectroscopic Determination of Substituent Effects in p-substituted Diarylcarbenium IonsDiarylfluorocarbenium hexafluoroantimonates have been prepared as crystalline salts and are characterised. The 19F-chemical shift of the methine fluoroatom is used as a measure of the relative stability of the studied carbenium ions. The relations of this measure of stability to the stability of p-fluoro substituted triaryl carbenium ions, the s̰ +-constants of the corresponding substituents, the pKR+- -values of the corresponding diarylcarbinols, and the stabilisation energy of substituted methyl cations in the vapour phase are discussed.
    Notes: Diarylfluorcarbenium-hexafluoroantimonate werden als kristalline Salze dargestellt und charakterisiert. Die 19F-chemische Verschiebung des Methinfluoratoms wird als Maß für die relative Stabilität der untersuchten Carbeniumionen benutzt. Die Beziehungen dieses Stabilitätsmaßes zur Stabilität p-fluorsubstituierter Triarylcarbeniumionen, den ρ+-Konstanten der jeweiligen Substituenten, den pKR+- -Werten entsprechend substituierter Diarylcarbinole und den Stabilisierungs-energien substituierter Methylkationen in der Gasphase werden diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198119810809
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  • 4
    Electronic Resource
    Electronic Resource
    Stabile Carbeniumionen, 29. Diarylhydroxycarbenium-perchlorate (1981)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 1424-1428 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stable Carbenium Ions, 291). - Diarylhydroxycarbenium PerchloratesDiarylhydroxycarbenium perchlorates are prepared as crystalline salts and are characterised.
    Notes: Diarylhydroxycarbenium-perchlorate werden als kristalline Salze dargestellt und charakterisiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198119810812
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  • 5
    Electronic Resource
    Electronic Resource
    Stabile Carbeniumionen, XIX. Untersuchungen über den Substituenteneinfluß von Chlor und Fluor in Diarylcarbeniumionen (1975)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1975 (1975), S. 835-848 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stable Carbenium Ions, XIX. - Investigation on the Substituent Effects of Chlorine and Fluorine in Diarylcarbenium IonsBis(4-halopheny1)carbenium hexachloroantimonates, halo(dipheny1)carbenium hexachloro- and hexafluoro-antimonates% well as bis(4-fluorophenyl)halocarbenium hexachloro- and hexafluoro-antimonates have been prepared and characterized. The acceptor strengths of the different carbenium ions were determined by halide transfer experiments. The charge delocalization on chloro and fluoro substituents was ascertained by 19F-NMR experiments with appropriately substituted fluoro derivatives. It could be shown that in the case where the substituent effect is transmitted by a phenyl ring fluorine stabilizes the carbenium ions better than chlorine whereas in the case of halogen attached directly to the positive center chlorine stabilizes more than fluorine. Fluorine stabilizes better than hydrogen. The total substituent effect is given by the sum of -Iρ-, +Iπ- und +E-effects.
    Notes: Bis(4-halogenphenyl)carbenium-hexachloroantimonate, Halogen(dipheny1)carbenium-hexa- chloro- und -hexafluoroantimonate sowie Bis(4-fluorpheny1)halogencarbenium-hexachloro- und -hexafluoroantimonate wurden dargestellt und charakterisiert. Die Akzeptorstärken der einzelnen Carbeniumionen wurden durch Chloridübertragungsexperimente ermittelt. Die Ladungsdelokalisierung auf die Chlor- und Fluorsubstituenten wurde durch 19F-NMR- Untersuchungen an entsprechend substituierten Fluorderivaten bestimmt. Dabei zeigte es sich, daß bei Übermittlung des Substituenteneffektes über einen Phenylring Fluor das Carbeniumion stabilisiert und Chlor destabilisiert, während im Falle einer direkten Bindung des Halogens an das positive Zentrum Chlor besser stabilisiert als Fluor. Allgemein stabilisiert Fluor ein positives Zentrum besser als Wasserstoff. Der Gesamteffekt der Substituenten ergibt sich aus der Summe von -Iρ-, +Iπ- und +E-Effekt.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197519750502
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  • 6
    Electronic Resource
    Electronic Resource
    Molecular Structure and the Properties of Liquid Crystals, von G. W. Gray. Academic Press, Inc., London-New York 1962. 1. Aufl., VI, 314 S., zahlr. Abb. und Tab., geb. £ 3.3- (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 76 (1964), S. 68-68 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19640760147
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  • 7
    Electronic Resource
    Electronic Resource
    Ueber das Jalappaharz (1852)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 83 (1852), S. 121-153 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.18520830202
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