necobalt(III), react regiospecifically with N,N-dimethylsulphamoyl chloride to give good yields of the rearranged product S-allyl-N,N-dimethylsulphonamide, e.g. 1,1,N,N-tetramethylallylsulphonamide. Symmetrical allylcobaloximes react similarly to give the expected single allylsulphonamides. Buta-1,2-dienylbis(dimethylglyoximato)pyridinecobalt(III) also reacts regiospecifically with N,N-dimethylsulphamoyl