Coupling reactions of chlorofluoro- and perfluoroalkyl iodides Rf-I with Rf = ClCF2CFCl(CF2)3CF2-, ClCF2CFClO(CF2)3CF2-, ClCF2CFCl-, (CF3)2CF- , (CF3)2CFCF2CF2- in the presence of a zinc/solvent system give dimers in good yields. Both homodimerizations (one iodide) and heterodimerizations (two different iodides) have been studied. The effect of temperature and solvent is shown. The zinc mediated dechlorination of vicinal chlorine atoms in the dimers afforded terminal alkenes and dienes.
氯氟烷基
碘化物Rf-I与Rf = Cl
CF2CFCl(
CF2)3
CF2-,Cl
CF2CFClO(
CF2)3
CF2-,Cl
CF2CFCl-,(
CF3)2CF-,( )2CF
CF2CF2-在
锌/溶剂体系存在下进行偶联反应,产生良好收率的二聚体。研究了同聚反应(一个
碘化物)和异聚反应(两个不同的
碘化物)。显示了温度和溶剂的影响。二聚体中邻位
氯原子的
锌介导脱
氯反应产生了末端烯烃和二烯烃。