Patent ID: 8664404

Claim:
A method for producing a 3-halo-1,2-benzisothiazole represented by formula (2): wherein R 1 is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkoxycarbonyl group having 2 to 5 carbon atoms, a nitro group or a halogen atom, and X is a halogen atom, the method comprising reacting a 1,2-benzisothiazol-3-one represented by formula (1) with a thionyl halide in a polar solvent: wherein R 1 is as defined in formula (2), and wherein the amount of the polar solvent is 1 to 6 mol based on 1 mol of 1,2-benzisothiazol-3-one.