1. Pouliot M F, Angers L, Hamel J D and Paquin J F 2012 Synthesis of 1,3,4-oxadiazoles from 1,2-diacylhydrazines using [Et2NSF2]BF4 as a practical cyclodehydration agent Org. Biomol. Chem. 10 988
2. Lei Y, Liu S, Li H and Ding M 2013 Microwave promoted synthesis of 2,5-diaryl-1,3,4-oxadiazoles using melamine formaldehyde resin supported sulfuric acid Asian J. Chem. 25 10454
3. Stolle R J, Milcent R, Barbier G, Reddy P S, Reddy P P, Chiba T, Okimoto M, Yang R Y, Dai L X, Jedlovska E and Lesko J 1906 A simple one-pot procedure for the synthesis of 1, 3, 4–oxadiazoles Prakt. Chem. 73 277
4. Milcent R and Barbier G 1983 Oxidation of hydrazones with lead dioxide: new synthesis of 1, 3, 4‐oxadiazoles and 4‐amino‐1, 2, 4‐triazol‐5‐one derivatives J. Heterocycl. Chem. 20 77
5. Reddy P S and Reddy P P 1987 Fusion of aroylhydrazines with acids. A new synthesis of 2, 5‐diaryl‐1, 3, 4‐oxadiazoles Ind. J. Chem. 26B 890