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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Scavenger Reactions of Short-lived Radicals, XIX1). - Reactions of 2,2′-Disubstituted 2,2′-Azopropanes with Trialkylstannyl and Trialkylsilyl Radicals2,2′-Disubstituted 2,2′-azopropanes 1a-c (X=Cl, PhS. PhO) undergo a rapid radical chain reaction with Me3SnH or Me6Sn2 to yield acetone azine (3) and Me3SnX (also phenol in the case of X=PhO). 1d (X=MeCOO) reacts analogously only with Me3SnH whereas, with Me6Sn2, the initiator tert-butoxyl radicals give only equimolar amounts of the azine 3. The corresponding X is split off as a radical X. or, as a consequence of fragmentation, as Me3SnX. The mechanisms involved are discussed. Et3SiH reacts only with 1a and b (X=Cl, PhS) in which X can undergo a SH2 reaction with silyl radicals to yield acetone azine (3).
    Notes: 2,2′-Disubstituierte 2,2′-Azopropane 1a-c (X=Cl, PhS, PhO) geben mit Me3SnH und Me6Sn2 eine schnelle radikalische Kettenreaktion zu Acetonazin (3) und Me3SnX (für X=PhO auch Phenol). 1d (X=MeCOO) reagiert analog nur mit Me3SnH, mit Me6Sn2 liefern die als Initiatoren eingesetzten tert-Butoxylradikale nur äquimolare Mengen an Acetonazin (3). Jeweils wird X als Radikal X. abgespalten oder unter Fragmentierung als Me3SnX. Die Mechanismen werden erörtert. Et3SiH reagiert nur mit 1a und b (X=Cl, PhS), bei denen eine SH2-Reaktion von Silylradikalen an X möglich ist, zu Acetonazin (3).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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