Fluorocarboethoxymethylene tri-n-butylphosphorane, Bu3P=CFCOOEt (3), reacts with per- and poly-fluoroalkyl-substituted carboxylic acid esters, ethyl formate and γ-butyrolactone to give the corresponding enol ethers, RFC (OEt)=CFCOOEt (4), in good yield. Non-activated esters failed to react with 3. With the anion derived from ethyl diethylphosphonofluoroacetate, (EtO)2P(O)CFHCOOEt (5), a mixture of 4 and β-ketoesters
氟碳乙氧基亚甲基三
正丁基膦,Bu 3 P = CFCOOEt(3)与
全氟烷基和多氟烷基取代的
羧酸酯,
甲酸乙酯和
γ-丁内酯反应,得到相应的烯醇醚,R F C(OEt)= CFCOOEt(4),高产。未活化的酯不能与3反应。用衍生自
二乙基膦酰基
氟乙酸乙酯的阴离子,形成(EtO)2 P(O)CFHCOOEt(5),4和β-
酮酸酯的混合物R F C(O)CFHCOOEt(7)。