The nitration of sym-triazolo[3,4-b]benzothiazole

The nitration of sym-triazolo3,4-b]benzothiazole (I) with a mixture of nitric and sulfuric acids has given 6-nitro-sym-triazolo3,4-b]benzothiazole (II). The structure of II was established by comparing its properties (mp, PMR spectrum) with those of the 7-nitro-sym-triazolo3,4-b]-benzothiazole (III) obtained by the ring closure of 2-hydrazino-6-nitrobenzothiazole (VI) with orthoformic ester. Compounds II and III have been converted into the corresponding acetylamino derivatives. Saponification of the acetyl groups has given amino derivatives of I.Translated from Khimiya Geterotsiklicheskikh Soedinenii, Vol. 6, No. 7, pp. 913–915, July, 1970.