Laser flash photolysis study of substituent effects on the rate of 1,2-H migration in a series of benzylchlorocarbenes
作者:Michael T. H. Liu、Roland Bonneau
DOI:10.1021/ja00036a003
日期:1992.5
Laser flash photolysis of para-substituted 3-chloro-3-benzyldiazirines in isooctane produces the corresponding carbenes, which react with pyridine to form ylides or undergo 1,2-H migration to form the (Z)- and (E)-β-chlorostyrenes. The rate for the 1,2-H migration is determined by plotting the pseudo-first-order rate constants for the growth of the ylide vs [pyridine] and extrapolating to zero pyridine
异辛烷中对位取代的 3-chloro-3-benzyldiazirines 的激光闪光光解产生相应的卡宾,它们与吡啶反应形成叶立德或经历 1,2-H 迁移形成 (Z)- 和 (E)-β-氯苯乙烯。1,2-H 迁移的速率是通过绘制叶立德与 [吡啶] 生长的伪一级速率常数并外推到零吡啶浓度来确定的,在(对氯苄基)氯卡宾的情况下,卡宾衰变可以在 310 nm 处直接监测,而在 [p-(三氟甲基)苄基]氯卡宾中