The synthesis of two benzo[c:d′]diisothiazoles

Two benzoc:d']diisothiazoles, 8-methylbenzo1,2-c:5,6-d']diisothiazole and 3-methylbenzo1,2-c:6,5-d']diisothiazole, have been made by reaction of appropriate aminomethyl-1,2-benzisothiazoles with N-sulfinylmeth-anesulfonamide.