Reactions of 2,3,5,6-tetrachloro-N-arylsulfenyl-1,4-quinonimines with arenesulfinic acids

Arenesulfinic acids react with 2,3,5,6-tetrachloro-N-arylsulfenyl-1,4-benzo quinonimines, following the 1,6-addition pattern. The reactions with excess arenesulfinic acid result in elimination of arenethiol and formation of 2, 3,5,6-tetrachloro-4-arylsulfonylaminophenols Oxidation of the latter yields 2,3,5,6-tetrachloro-N-arylsulfonyl-1,4-benzoquinonimines which are difficu lt to obtain by other methods.