A Convenient Synthesis of Alkyl and Aryl Substituted Bis-1,3,4-oxadiazoles

Substituted bis-1,3,4-oxadiazoles 3a-1 have been synthesized from the cyclization of N,N'-diaroyl or N,N'-dialkanoyl diacyl hydrazides, in presence of phosphorus oxychloride. A11 new compounds have been identified by 1H-NMR 13C-NMR and elemental analysis.