Free radical addition to olefins. Part XIII. Photolysis of bromodichloromethane in the presence of olefins
作者:Janet C. Gibb、John M. Tedder、John C. Walton
DOI:10.1039/p29740000807
日期:——
leads to a mixture of products in which both dichloromethyl (CHCl2·) and bromodichloromethyl (CBrCl2·) radicals are chain carrying species. In contrast to earlier reports of liquid phase studies the radical which predominates in addition to alkenes in the gas phase is the bromodichloromethyl radical.
已经研究了单独的溴二氯甲烷在乙烯和氟乙烯存在下的光解作用。尽管主要的光解步骤涉及碳-溴键的裂变:CHCl 2 Br [省略图示] CHCl 2 ·+ Br·随后的载链过程涉及氢的提取与溴的提取一样多:R·+ CHCl 2 Br → RH + CCl 2 Br ·,R·+ CHCl 2 Br → RBr + CHCl 2 ·从溴代二氯甲烷中提取氢和溴几乎同等重要,导致了产物混合物,其中二氯甲基(CHCl 2 ·)和溴代二氯甲基(CBrCl 2·)自由基是带链物质。与较早的液相研究报道相反,在气相中除了烯烃外,主要的自由基是溴二氯甲基自由基。