... Perqamon Journals Ltd. LEWIS ACID MEDIATED REACTIONS OF N-PHENYL-(4- METHYLPHENYL)-SULFOXIMIDOYL CHLORIDE WITH ALKYNES. A NOVEL ROUTE TO BENZOTHIAZINES. Michael Harmata* and Elmer 0. Schlemper Department of Chemistry, University of Missouri Columbia, MO 65203 Summary: A general route to benzothiazines has been developed. in the presence of an alkyne ...