gem-(Difluoroallyl)lithium: Preparation by lithium-halogen exchange and utilization in organosilicon and organic synthesis
作者:Dietmar Seyferth、Robert M. Simon、Dennis J. Sepelak、Helmut A. Klein
DOI:10.1021/ja00352a019
日期:1983.7
Abstract : GEM-Difluoroallyllithium may be generated by lithiumbromine exchange between n-butyllithium and CH2=CHCF2Br at -95 degrees C using an in situ procedure. When this Li(CF2CHCH2) preparation is carried out in the presence of chlorosilanes, aldehydes, ketones and esters, products of type R3SiCF2CH=CH2, RCH(OH)CF2CH=CH2, RR'C-(OH)CF2CH=CH, respectively, are formed, often in good yield. The factors
摘要 : GEM-二氟烯丙基锂可以通过正丁基锂和 CH2=CHCF2Br 在 -95 摄氏度下使用原位程序进行溴化锂交换来生成。当此 Li(CF2CHCH2) 制备在氯硅烷、醛、酮和酯的存在下进行时,分别为 R3SiCF2CH=CH2、RCH(OH)CF2CH=CH2、RR'C-(OH)CF2CH=CH 类型的产物,形成,通常产量良好。除了不对称取代的烯丙基锂试剂的 C=0 之外,还讨论了决定区域选择性的因素。(作者)