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《Chemical Production and Technology》 2004-01
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Synthesis of 2, 5-Dimercapto-1, 3, 4-Thiadiazole with Triethylamine as A Catalyst

Nie Guochao (Scientific Research Department, Xiangfan Vocational and Technical College, Xiangfan Hubei 441021)  
Dimercapto-1, 3, 4-thiadiazole was prepared with triethylamine as a catalyst. Compared with the traditional synthesis techniques, triethylamine as a catalyst can raise the reaction yield from 82.50 to 90.01%. The catalytic mechanism was studied and the optimal reaction conditions were found by experiments. The optimum material ratio, n (hydrazine hydrate):n (carbon disulfide):n (KOH) is 1.0:3.5:2.0, suitable reaction temperature is 80 ℃and triethylamine 40 mg is required. The construction of the product was analyzed by infrared spectrum,and nitrogen content and melting point of the product were measured,the results were accorded with the theoretical value. The results showed that the claimed route of synthesizing 2,5-dimercapto-1,3,4-thiadiazole is viable and the method of synthesis is of practical use.
【CateGory Index】: TQ25
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