O-Xylene → 7-Thia-2,4,5-triazatricyclo(6.4.0.0,2,6)dodeca-1(12),3,5,8,10-pentaene

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2-Hydrazinobenzothiazole (125 grams; 0.76 mole), ethyl orthoformate (112.4 grams, 0.76 mole), and 2 liters of xylene were heated together with stirring in a three-necked 5-liter flask. An 8-inch column with a condenser was placed in one neck. The reaction was heated to 105° C. and soon all the solid had gone into solution and the solution turned red. Ethanol began to distill from the reaction and about 125 milliliters of it was collected before the reaction was stopped and allowed to cool to room temperature. The yellow precipitate was collected and triturated with diethyl ether. The s-triazolo(3,4-b)benzothiazole product thus obtained was recrystallized from chloroform, m.p. 174.5°-7° C.

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