Control of Carbene Reactivity by Crystals. A Highly Selective 1,2-H Shift in the Solid-to-Solid Reaction of 1-(4‘-Biphenylyl)-2-phenyldiazopropane to (<i>Z</i>)-1-(4‘-Biphenylyl)-2-phenylpropene
作者:Steve H. Shin、Deniz Cizmeciyan、Amy E. Keating、Saeed I. Khan、Miguel A. Garcia-Garibay
DOI:10.1021/ja9633225
日期:1997.2.1
highly selective photochemical solid-to-solid reaction. The solid state reaction was shown to proceed via a carbene intermediate, and it was formulated as a 1,2-H shift with unprecedented stereoselectivity. It was shown that irradiation of 1a in inert solvents gives products via 1,2-H shifts [(Z)-3a and (E)-3a] and 1,2-Ph migrations [(Z)-4a and (E)-4a] in yields that vary strongly with the polarity
1-(4'-联苯基)-2-苯基重氮丙烷 (1a) 的宝石红色多晶样品有效转化为无色 (Z)-1-(4'-联苯基)-2-苯基丙烯 [(Z)-3a]在高选择性光化学固对固反应中的产率为 96%。固态反应显示通过卡宾中间体进行,并将其制定为具有前所未有的立体选择性的 1,2-H 转变。结果表明,1a 在惰性溶剂中的辐照通过 1,2-H 位移 [(Z)-3a 和 (E)-3a] 和 1,2-Ph 迁移 [(Z)-4a 和 (E)- 4a] 的收率随溶剂的极性变化很大。1a 在乙醇中的照射产生了类似的产物以及来自将卡宾插入 EtO-H 键的醚 5a。