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  • Organic Chemistry  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 372-375 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Cyclic N-(2-Arylvinyl)ureas by Wittig ReactionTriphenyl(α-ureidoalkyl)phosphonium salts (1, 2, 8) react with aromatic aldehydes and ketones to give quite easily N-(2-arylvinyl)ureas (4a, b, 5a-i, 7, 9) according to Wittig.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 235-240 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Facile Synthesis of Ketene O,N-Acetals and Ketene O,O-Acetals by Tosylate EliminationReaction of the alcohols 4 and 5 with p -toluenesulfonyl chloride leads to the sulfonic esters 6 and 7, respectively, which on treatment with potassium tert-butylate easily react to give the ketene O,N-acetals 8 and O,O-acetals 9, respectively. The (E/Z) isomers 8 arising from the elimination reaction of 7 were identified by their 1H-NMR data after X-ray analysis of one of the isomers of 8e. On one example it is shown that the elimination reaction proceeds stereoselectively „anti“.
    Notes: Durch Reaktion der Alkohole 4 und 5 mit p-Toluolsulfonylchlorid erhält man die Sulfonsäureester 6 und 7, die mit Kalium-tert-butylat unter Eliminierung leicht zu den Keten-O,N-acetalen 8 bzw. -O,O-acetalen 9 reagieren. Die aus 6 entstehenden (E/Z)-Isomere 8 konnten nach Röntgenstrukturanalyse eines der Isomeren von 8e auch 1H-NMR-spektroskopisch identifiziert werden. An einem Beispiel wurde gezeigt, daß die Tosylat-Eliminierung stereoselektiv „anti“ abläuft.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0170-2041
    Keywords: Ketene O,N-acetals ; Antifungal agents ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Facile and Selective Synthesis of (Z)-tert-Butylketene O,N-AcetalsMelting the ketene O,O-acetals 1 with azoles in the presence of a catalytic amount of a proton acid yields the ketene O,N-acetals 2. The products of this phenol-azol substitution reaction are obtained as their (E/Z)-mixtures with the (Z)-isomers highly predominating. The (E)-isomers are easily converted into the (Z)-isomers by a proton acid catalysed isomerisation reaction.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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