2,2-dihalovinyl haloformates and process of preparation

摘要

Novel 2,2-dihalovinyl haloformates are described of general formula: <IMAGE> in which: X is a chlorine or bromine atom; X1 and X2 are the same or different and are chlorine or bromine. The compounds are prepared by reaction of a 1,2,2,2-tetrahaloethyl haloformate of formula: <IMAGE> in which: X1, X2 and X are as described hereinabove; X3 is chlorine or bromine and is always bromine when X1 and/or X2 is bromine and X4 is chlorine or bromine, with a metal such as zinc or magnesium in a solvent. The novel compounds are very useful for the preparation of 2,2-dihalovinyl carbonates and carbamates which may be used as insecticides or as comonomers.