The experimental data indicate that joint polymerization of styrene and butadiene results in copolymers of varied structure. Of the styrene, 31.2 per cent forms, with the butadiene, macromolecules in which the two components alternate regularly, whereby the butadiene combines in its 1,4-position. Forty per cent of the styrene forms macromolecules, in which two units of styrene interlink adjacently. Such “styrene pairs” are separated by one or more molecules of butadiene polymerizing in their 1,4-position. The remaining 29 per cent of styrene evidently enters into the composition of branched macromolecules, formed as the result of butadiene linking both in the 1,2- and in the 1,4-positions. Taking into consideration the fact that formic acid must have been formed from macromolecules, with butadiene linked in the 1,2-position, we can conclude that 23.3 per cent of the butadiene polymerized in its 1,2-position, and the rest in the 1,4-configuration.

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Diazotization of the aminobenzothiadiazole (I) and subsequent reduction with stannous chloride give the stannic chloride‐hydrazinobenzothiadiazole complex (IV) which is cyclized with the carbonyl compounds (V) either via the hydrazones (VIa) or directly, producing the title compounds (VII).