Synthesis and Characterisation of Some New Substituted ( , -diphenyl- -hydroxymethyl)-1,2,4-triazoles-1,3,4-oxadiazoles and 1,3,4-thiadiazoles

Abstract

Abstract Several new substituted-4-alkyl/aryl semicarbazides (2a-d) were synthesized. Subsequent ring closure of substituted (2a-d) yield 2-amino alkyl/aryl-5-substituted-1,3,4-oxadiazoles (3a-d) and substituted-1,2,4-triazoles (4a-d) under acidic and basic media respectively. Methylation of compounds (4a-d) gave substituted methoxy-1,2,4-triazoles (5a-d). The reaction of benzilic acid hydrazide (I) with formic acid gave 1-formyl-2-( , -diphenyl- -hydroxyacetyl) hydrazine (6). Refluxing of the later with phosphorus pentoxide and phosphorus pentasulfide gave oxa/thiadiazole (7 and 8) respectively. The structures of all products were elucidated by physical and Spectroscopic methods.