Novel base-induced rearrangements of .ALPHA.- and N-halo derivatives of S-ary-S-((1,2-benzisoxazol-3-yl)methyl)sulfoximides to the corresponding N-sulfinylimines.

The title α- and N-halosulfoximides 1-4 undergo base-induced rearrangement reactions to give the same N-sulfinylimines 5, suggesting that these rearrangements all involve the intermediacy of a cyclic sulfoximide, a thiazirine S-oxide 14, which has a novel three-membered ring system with an endocyclic S=N group.