Halogenated hydrocarbons of formula: RR.sup.1 C.dbd.CH--CH.sub.2 CYZQ and RR.sup.1 C.dbd.CH--CH.dbd.CYQ, and mixtures thereof, wherein Y is F, Cl or Br, R is hydrogen or a lower alkyl group, R.sup.1 is a lower alkyl group, Z is Y or Q and Q is W(CF.sub.2).sub.m -- in which W is hydrogen, F or Cl and m is 1 or 2, and a process for their preparation which comprises heating in a polar aprotic solvent, preferably in the presence of an alkali metal halide, a halogenated hydrocarbon of formula RR.sup.1 C--CHX--CH.sub.2 CYZQ wherein R,R.sup.1,Y,Z and Q have the previously defined meanings and X is Cl, Br or I, provided that X is always Br or I when at least one of Y and Z is Br.
式为RR.sup.1 C.dbd.CH--CH.sub.2 CYZQ和RR.sup.1 C.dbd.CH--CH.dbd.CYQ的卤代烃,以及它们的混合物,其中Y为F、Cl或Br,R为氢或较低的烷基,R.sup.1为较低的烷基,Z为Y或Q,Q为W(CF.sub.2).sub.m--,其中W为氢、F或Cl,m为1或2,以及它们的制备方法,包括在极性无
水溶剂中加热,优选地在碱
金属卤化物的存在下,式为RR.sup.1 C--CHX--CH.sub.2 CYZQ的卤代烃,其中R、R.sup.1、Y、Z和Q具有先前定义的含义,X为Cl、Br或I,但当Y和Z中至少有一个为Br时,X始终为Br或I。