3,5-diphenyl-4,5-dihydro-1H-pyrazole → 1H-Pyrazole, 3,5-diphenyl-

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Reaction Steps

3,5-Diphenyl-2-pyrazoline (21.9 parts) is dissolved in ethylene dichloride (75 parts by volume). There is next added 5% palladium on carbon catalyst (4 parts containing 40% water) is added and the mixture is heated at reflux for 8 hours. There is obtained 3,5-diphenylpyrazole in a 79.3% yield whose melting point ranges from 196° to 200° C.

Provenance & Evidence