C. Dong
2011
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Journal
Guangzhou Chemistry
Abstract
1H-pyrazole-4-carboxylic acid was synthesized from ethyl cyanoacetate and triethyl orthoformate via Claisen condensation,cyclization,deamination and hydrolysis reactions.The intermediate compound and the title compound were characterized by MS,1H NMR and 13C NMR.With this method,the yield of 1H-pyrazole-4-carboxylic increased from 70% reported in literature to 97.1%.