The Condensation of Aryl Carboxylic Acid Hydrazides with Orthoesters

  • Ainsworth C
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Abstract

Nineteen 2-aryl-1,3,4-oxadiazoles, or 2-alkyl-5-aryl-1,3,4-oxadiazoles were re prepared by the condensation of aryl carboxylic acid hydrazides with orthoesters. In two examples the 1-acyl-2-ethoxymethylenehydrazine intermediate was isolated. Thiobenzoic acid hydrazide and ethyl orthoformate formed 2-phenyl-1,3,4-thiadiazole. 3-Pyrazolecarboxylic acid hydrazide and ethyl orthoformate gave pyrazolo[1,5-d]as-triazin-4(5H)-one rather than the oxadiazole

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Authors

  • C. Ainsworth

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