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  • 1
    Electronic Resource
    Electronic Resource
    Wittig-Reaktionen mit Cyanhydrinen sowie Redoxreaktion des 4-Nitromandelsäurenitrils (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2914-2920 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Wittig Reactions of Cyanohydrines and Redox Reaction of 4-NitromandelonitrileSubstitued mandelonitriles 5 (R1 = H, OCH3, NO2) react in the presence of sodium tert- butoxide as a base like the corresponding aldehydes with substituted benzylidenetriphenylphosphoranes via the Wittig reaction to yield 4,4′-disubstituted stilbenes 8, for which the (E)/(Z) stereoisomer ratios are given. Our results refer to a reaction with a preceding cyanohydrine-aldehyde equilibrium. 4-Nitromandelonitrile (5a) forms in a basic methanolic solution via a redox reaction a mixture of dimethyl 4,4′-azoxybenzenedicarboxylate (11) and methyl 4-nitrobenzoate (12).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140822
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  • 2
    Electronic Resource
    Electronic Resource
    Synthese und Kristallstruktur von (E)-α-(Trifluormethyl)stilben (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 3384-3388 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and X-Ray Structure of (E)-α-(Trifluoromethyl)stilbeneStarting from benzyltriphenylphosphonium chloride and ω,ω,ω-trifluoroacetophenone α-(trifluoromethyl)stilbene was prepared with 91% yield with a phase transfer-catalyzed Wittig reaction with solid KF but without bases. The isolated isomer was found by X-ray structure analysis to have the thermodynamic preferred (E)-configuration. For this configuration it was determined a torsion angle of 71.3° between the two cis-configurated phenyl rings because of steric hindrance. AH⃜F hydrogen bridge (distance: 223.8 pm) stabilizes the (E)-isomer.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801131030
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  • 3
    Electronic Resource
    Electronic Resource
    Phasentransferkatalysierte Wittig-Reaktionen ohne Basenzusatz (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2342-2346 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Basefree Wittig Reactions with Phase Transfer CatalytsKetones like trifluoroacetyl compounds  -  giving the haloform reaction in basic solutions  -  are able to react with mono or bis phosphonium fluorides without bases via Wittig reactions with very good yields. The phosphonium fluorides are prepared very easily from other phosphonium halides under phase transfer catalysis of crown ethers. The ratio of the stereoisomeric alkenes in the product and the spectra of the trans- respectively trans-trans alkenes are given.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120642
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    Paper (German National Licenses)
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