The reaction between secondary Grignardreagents and alkylthioarenes or alkylthioalkenes in the presence of 1:1 nickel dichloride–triphenylphosphine causing the substitution of alkylthio-groups by hydrogen atoms, the nickel(0)-induced replacement of alkylthio-groups of the aforementioned sulphides by alkyl or aryl functions, and the observation of regiocontrol in the catalysed reactions of Grignard