Fluorinated phosphonium ylides: versatile in situ Wittig intermediates in the synthesis of hydrofluorocarbons
作者:Pinaki S. Bhadury、Meehir Palit、Mamta Sharma、Syed K. Raza、Devendra K. Jaiswal
DOI:10.1016/s0022-1139(02)00104-5
日期:2002.7
has been developed for the synthesis, characterisation and isolation of hydrofluoro/hydrohalofluorocarbons such as chlorodifluoromethane (CF2ClH), difluoromethane (CF2H2), bromodifluoromethane (CF2BrH) and dibromofluoromethane (CFBr2H) as possible chlorofluorocarbon (CFC) alternatives. The Wittig reaction of carbonyl compounds with in situ generated triphenylphosphonium ylides in DMF forms terminal fluoroolefins
已经开发了一种简单方便的技术来合成,表征和分离氢氟/氢卤代碳氢化合物,例如氯二氟甲烷(CF 2 ClH),二氟甲烷(CF 2 H 2),溴二氟甲烷(CF 2 BrH)和二溴氟甲烷(CFBr 2H)可能是氯氟烃(CFC)的替代品。羰基化合物与DMF中原位生成的三苯基phosph的Wittig反应形成末端氟代烯烃。但是,在不存在羰基部分的情况下,这些烷基化物会分解。在没有羰基部分的情况下,在DMF中氟亚甲基三苯基phosph的高反应活性已被首次用于设计氢氟烃的合成。