validation (pred_r2) values of 0.6969 and 0.6148 respectively. Title compounds of 1,3,4-oxadiazolederivatives were synthesized by the ring closure reactions of various acylhydrazides with carbon disulphide (4a–e) and with aromatic acids in POCl3 (5a–e). After structural elucidation, all the synthesized compounds were evaluated for their antimicrobial activity against Escherichia coli, Staphylococcus aureus