A process for the preparation of a compound of formula (I): HetSCH.sub.2 CH.sub.2 CH.dbd.CF.sub.2 (I) wherein Het is an optionally substituted 5- or 6-membered heterocyclic ring, which comprises reacting a compound of formula (II): HetSH (II) with a compound of formula (III): CF.sub.2 .dbd.CHCH.sub.2 CH.sub.2 L (III) wherein L is chlorine or bromine or a group --OSO2R.sup.a wherein R.sup.a is a C1-4 alkyl group or a phenyl group optionally substituted by a C1-4 alkyl group.
一种制备式(I)化合物的方法:HetSCH.sub.2 CH.sub.2 CH.dbd.CF.sub.2(I)其中Het是可选取代的5-或6-成员杂环,包括将式(II)化合物与式(III)化合物反应:HetSH(II)与CF.sub.2.dbd.CHCH.sub.2 CH.sub.2 L(III)其中L是
氯或
溴或基团--OSO2R.sup.a,其中R.sup.a是C1-4烷基或可选取代C1-4烷基的苯基。