STUDIES ON SOLID-STATE REACTION OF 1-PHEN YL-3-METHYL-5-PYRAZOLONE WITH DICARBONYL-COMPOUNDS

The solid state reactions of benzil, p-dirnethylaminobenzil, 4,4'-dibr omobenzil, p-dimethylaminobenzoin and o-phthalimide with 1-phenyl-3-me thyl-5-pyrazolone,were reported. This thermal reaction was carried out at 120 degrees C for 0.5 h and gave one of the 1 : 1 condensation iso mers in a higher selectivity. The structures of seven new products wer e identified by IR, H-2 NMR, MS and elementary analysis, and the confi guration of the product nyl-3-methyl-4-benzoylphenylmethylene-5-pyrazo lone 1 was determined by X-ray diffraction analysis. In the molecule o f compound 1, there is four plans rather than coplanar, Benzoyl group and CO group of five membered ring are in cis-positions, the interacti on of oxygen atoms leads to noncoplanar.