N-Alkenyl Acylketene S,N-Acetals from 2,3-Dihydro-1,3-benzothiazoles and Carboxylic Anhydrides. X-Ray Molecular Structure of 2-(Butyrylmethylene)-N-(cyclohex-1-enyl)-2,3-dihydro-1,3-benzothiazole
Depending on the reaction conditions or starting materials used, 2,3-dihydro-1,3-benzothiazoles 1 or their N-acyl derivatives 2 react with carboxylic anhydrides to yield the corresponding enamides 3 and/or N-alkenyl acylketene S,N-acetals 4.The structural