二氟甲烷
化学
维蒂希反应
钋
部分
有机化学
原位
分解
反应性(心理学)
医学
机械工程
工程类
气体压缩机
病理
制冷剂
替代医学
作者
Pinaki S. Bhadury,Meehir Palit,Mamta Sharma,S. K. Raza,Devendra K. Jaiswal
标识
DOI:10.1016/s0022-1139(02)00104-5
摘要
A simple and convenient technique 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. However, in the absence of the carbonyl moiety these ylides undergo decomposition. The high reactivity of fluoromethylene triphenylphosphonium ylides in DMF in the absence of the carbonyl moiety has been exploited for the first time to design the synthesis of hydrofluorocarbons.
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