Abstract The reaction of the appropriate 2-benzothiazolinone with 2-chloroacetamide under basic conditions afforded the 2-oxo-3 (2H)-benzothiazolineacetamides 6–9. The 2-thioxo-3 (2H)-benzothiazolineacetamide (10) was prepared by the reaction of 3-(carbethoxymethyl) benzothiazoline-2-thione with ammonium hydroxide. The reaction of acetamides 6–10 with the appropriate anhydride containing a catalytic amount of the sodium salt of the acid ...