Abstract Unstable 5-aryl-2-(3-benzylidene-2-phenylcarbazoyl)-1, 2, 3, 4-tetrazoles 8 have been prepared. By thermal ring transformation, they gave 5-aryl-2-(2-benzylidene-1- phenylhydrazino)-1, 3, 4-oxadiazoles 9., Hydrazinolysis of 9 afforded 5-aryl-2-(1-
