Abstract: A process for preparing an aliphatic thioamide entails reacting a nitrile compound of the general formulaR.sub.1 R.sub.2 R.sub.3 C--CN,wherein R.sub.1 denotes a hydrogen atom, an alkyl radical containing from 1 to 5 carbon atoms or an aryl radical and R.sub.2 and R.sub.3 each denotes a hydrogen atom containing from 1 to 5 carbon atoms, with hydrogen sulphide, in the presence as catalyst of an aliphatic amine of the general formulaR.sub.4 R.sub.5 R.sub.6 N,wherein R.sub.4 denotes an alkyl radical containing 1 to 5 carbon atoms and R.sub.5 and R.sub.6 each denotes a hydrogen atom or an alkyl radical containing 1 to 5 carbon atoms, in a water-miscible polar solvent.

Abstract: A process for the preparation of a substituted thiazole comprises reacting an isothiocyanate compound of the general formulaHal.CH(R.sub.1). CH.dbd.C(R.sub.2).NCSin which Hal is a chlorine or bromine atom and R.sub.1 and R.sub.2 is each a hydrogen atom or an alkyl group containing 1 to 3 carbon atoms, in solution with a chlorinating or brominating agent. The compound 2-chloro-5-(chloromethyl) thiazole, which is an important intermediate in the manufacture of agrochemical and pharmaceutical products, may very advantageously be prepared by this method.