Synthese d'un nouveau monomere hydrofluorocarboxylique le difluoro-2,2-butene-3-oate d'ethyle
作者:D. Morel、F. Dawans
DOI:10.1016/0040-4020(77)88002-2
日期:1977.1
The reaction of bromine with chlorotrifluoroethylene yields an addition product BrCF2CFClBr, which can be further transformed into BrCF2COOC2H5 by hydrolysis with oleum and esterification. The mono adduct ester, BrCH2CH2CF2COOC2H5, is selectively obtained by ethylene telomerization in the presence of a radical initiator and ethyl bromodifluoroacetate as telogen; side-addition of two ethylene molecules
溴与三氟氯乙烯的反应生成加成产物BrCF 2 CFClBr,可通过发烟硫酸水解和酯化将其进一步转化为BrCF 2 COOC 2 H 5。在自由基引发剂和溴代二氟乙酸乙酯作为调解剂的存在下,通过乙烯的端聚反应选择性地得到一元加成酯BrCH 2 CH 2 CF 2 COOC 2 H 5。不能完全避免两个乙烯分子的侧面加成。该酯用乙醇钠脱氢溴化,得到2,2-二氟3-丁烯酸乙酯,CH 2 = CH -CF 2 COOC 2高5