Synthese des α,ω-dichlorures d'acide a chaines chlorofluorees par hydrolyse des α,ω-bis trichloromethyles correspondants

Article abstract of DOI:10.1016/S0022-1139(00)81098-2

This paper describes the transformation of α,ω-bis(trichloromethyl) compounds into perhalogenated diacid chlorides.The general formulae of the starting products are CCl3-(CF2-CFCl)x-CF2-CCl3 (I,x) with x=0, 1, 2 and CCl3-CF2-CCl2-CF2-CCl3 (II).Hydrolysis, by oleum, of compounds (I,0) and (I, 2) leads to the corresponding diacid chlorides.Hydrolysis of (I, 1) and (II) however yields perhalogenated cyclic, sixmembered stable acid anhydrides.In the second part of this work, several methods are compared for synthesizing diacid chlorides from diacids or cyclic anhydride s prepared by the hydrolysis of (I, 1) and (II).We have found that of these the most interesting is the reaction between a perhalogenated diacid with 1,4-bis(trichloromethyl)benzene.The perhalogenated diacid chlorides are prepared with a minimum yield of 50percent.