Zhang Dayong
2005
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Journal
Journal of Nanjing Normal University
Abstract
5-Amino-1,2,3-thiadiazoles can be composed through a series of reactions of diethyl carboxylate, hydrazine hydrate and chloroacetaldehyde. The synthetic conditions of each step are optimalized—the 4 step method of intermediate 5-chloro-1,2,3-thiadiazole is shortened to a 3 step method, and steam distillation is improved. The purity reached 99% (by GC). The product 5-amino-1,2,3-thiadiazoles can be obtained from chloroform∶ethyl alcohol (V/V)= 4∶1, mp:138~139℃, the overyield is about 40%.