Reactivity of Functionalized Arylcarbenes. 2-Phenylethyl Side Chains and Hetero Analogues
作者:Wolfgang Kirmse、Wolfgang Konrad、Ismail S. Özkir
DOI:10.1016/s0040-4020(97)00338-4
日期:1997.7
reactions with β-C-H bonds were observed, pointing to a triplet abstraction-recombination mechanism. Large kinetic and stereochemical deuterium isotope effects support this notion. The ample formation of benzocyclobutenes from 2-CH2-X-Ph substrates is due to insertion of the carbenes into ArCH2-X bonds. Addition to the terminal phenyl groups competes with C-H and C-X insertion. The results of benzophenone
在邻位具有-X-CH 2 Ph和-CH 2 -X-Ph(X = CH 2,O,SiMe 2)基的苯碳烯是由重氮或甲苯磺酰hydr前体热解和光解生成的。观察到具有β-CH键的立体随机插入反应,指出了三重态抽象重组机制。较大的动力学和立体化学氘同位素效应支持了这一观点。由2-CH 2 -X-Ph底物充分形成苯并环丁烯是由于将羧化物插入ArCH 2中-X键。除末端苯基外,CH与CX的插入竞争。二苯甲酮敏化和甲醇捕获的结果表明,官能化的芳基碳烯的分子内反应最多只能与自旋反转竞争地进行。©1997爱思唯尔科学有限公司。