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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 1702-1714 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thioketene Syntheses, II1). - Formation of Thioketenes from Alkylidenephosphoranes and Carbon DisulfideThe alkylidenephosphoranes 3a-c react with carbon disulfide (4) to give the dipoles 5a-c. Starting from phosphoranes 3 with bulky (3d) or aryl substituents (3e) secondary reactions occur in situ. Products detected in these reactions as well as in the thermolysis of 5a-c are triphenylphosphane sulfide (8), triphenylphosphane (15), and the trithiepins 16a, b. Amines 18 as trapping reagents for the potentially occurring thioketenes 9 react with 5a to afford the thioamides 19b-d. Trapping reactions with azomethines 22 lead to the β-thiolactam 24, the thiazetidines 25, and the hexahydropyrimidinethiones 26. According to product analysis, it seems that not the thioketenes 9, but the thioketenoid intermediates 7 are intercepted in the trapping reactions.
    Notes: Die Alkylidenphosphorane 3a-c treten mit Kohlenstoffdisulfid (4) zu den Dipolen 5a-c zusammen. Ausgehend von Phosphoranen 3 mit sterisch anspruchsvoller (3d) oder Aryl-Substitution (3e) laufen in situ Folgereaktionen ab. Dabei lassen sich wie auch bei der Thermolyse von 5a-c Triphenylphosphansulfid (8), Triphenylphosphan (15) und die Trithiepine 16a, b nachweisen. Amine 18 als Abfangreagenzien für die potentiell auftretenden Thioketene 9 führen mit 5a zu den Thioamiden 19b-d. Abfangreaktionen mit Azomethinen 22 ergeben das β-Thiolactam 24, die Thiazetidine 25 und die Hexahydropyrimidinthione 26. Nach der Produktanalyse sind als Reaktionspartner der Abfangreagenzien nicht die Thioketene 9, sondern die Thioketenoiden Zwischenstufen 7 wahrscheinlich.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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