Y. Akama, M. Shiro, T. Ueda
Jul 15, 1995
Citations
1
Influential Citations
19
Citations
Journal
Acta Crystallographica Section C-crystal Structure Communications
Abstract
The tautomeric keto and enol forms of 4-benzoyl-3-methyl-1-phenyl-5(2H)-pyrazolone, C 17 H 14 N 2 O 2 , have been prepared and their crystal structures characterized by X-ray analysis. The unit cell of the enol form, 4-benzoyl-5-hydroxy-3-methyl-1-phenylpyrazole, contains two structural conformers. The intramolecular distances in the enol form [2.621(3) and 2.663 (2) A] indicate the presence of hydrogen bonds, while the corresponding distance in the keto form [3.079 (3) A] does not. In the keto form there is an intermolecular hydrogen bond [2.673(3) A] between the imino N(2) atom and the carbonyl O(1) atom.