Photo‐Oxidation of Some DI‐2‐Benzothiazolymethane Derivatives

Abstract

We report the photo-oxidation of some di-2-benzothiazolylmethane derivatives and discuss the structure of the isolated methanols and ketones.In the course of a recent study of the CH/NH tautornerism of several 2-benzothiazolylmethane derivatives --1-7 (1, 2), we observed that these compounds were light-sensitive. Their high susceptibility towards photocatalysed oxidation reactions precluded the normal treatment of the above mentioned tautomerism, and in fact, the extreme lability of compound 4, induced the erroneous structural assignment of carbinol a as a tautomeric form of 4 (3, 4). On the other hand, large amounts of 9 and 1p were also obtained in the methylation of anions derived from 2 and 4 (5).