Reactions of 1-halocycloheptenes with KO-t-Bu in DMSO and THF were studied. The principal products obtained could be accounted for on the basis of two competing dehydrohalogenation mechanisms. These are: dehydrohalogenation across the C1-C2 bond to give cycloheptyne; and dehydrohalogenation across the C1-C7 bond to give 1,2-cycloheptadiene. One or both of these intermediates react with KO-t-Bu to give
研究了1-卤代
环庚烯与KO-t-Bu在
DMSO和THF中的反应。可以根据两种竞争的脱氢卤化机理解释所获得的主要产物。它们是:穿过C 1 -C 2键的脱卤化氢,得到环庚炔;并通过C 1 -C 7键脱卤化氢,得到1,2-环庚二烯。这些中间体中的一种或两种与KO-t-Bu反应以低收率得到1-t-丁氧基
环庚烯。来自两种溶剂中的三个1-卤代
环庚烯的主要产物是
三环[7.5.0.0 2 8]
十四烷基-2,14-二烯(4),即1,2-环庚二烯的二聚体。也形成有5,的2(8),14-二烯异构体4,推测是通过1,2-环庚二烯和cycloheptyne,和环加成6,的2,13二烯异构体4,通过重排4由KO叔卜实现。