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Communication | Special issue | Vol 25, No. 1, 1987, pp.79-82
Published online, 1st January, 1970
DOI: 10.3987/S-1987-01-0079
Reactions of Diphenylcyclopropenone with Hydrazine Derivatives: Formation of Pyrazolone Derivatives via 3-Aminocinnamohydrazides

Takashi Toda, Masaaki Yoshida, Tetsuo Katayama, and Masahiro Minabe

*Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya 321-8585, Japan


Reactions of diphenylcyclopropenone (1) with hydrazine or phenylhydrazine gave ring opening products (4,5- diphenylpyrazolones, 3) via 3-aminocinnamohydrazide derivatives (4). However, hydrazones (2) were obtained, in general, with 1 and hydrazine derivatives which possess electron accepting substituents under acidic conditions. Mechanism of the above reactions is discussed.