Benzothiazolium derivatives. III. Nucleophilic substitution reactions of benzothiazolium salts

The reactions of 2,3‐dihydrothiazolo[2,3‐b]benzothiazolium bromide 1 (A− Br−) with certain nucleophilic reagents have been performed for the purpose of ascertaining the reaction pathways and identifying the group that is displaced from the central carbon atom of the dithiocarbamate system. The nature of complex salt‐like intermediates formed initially from 1 (A− Br−) has been studied and confirmed. For comparison, a number of nucleophilic substitution reactions of 2‐methylthio‐3‐methylbenzothiazolium iodide 17 and 2‐dimethylamino‐3‐methylbenzothiazolium perchlorate 18 have been examined.