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 : G
EM-二
氟烯
丙基锂可以通过
正丁基锂和
CH2=CH
CF2Br 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(
CF2CH ) 制备在
氯硅烷、醛、酮和酯的存在下进行时,分别为 R3Si
CF2CH= 、RCH(OH)
CF2CH= 、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)