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

Participants

Reaction Steps

The procedure of Example 18 is followed except that 2 parts of 5% palladium on barium sulfate are used in lieu of the palladium on alumina Example 18. Following a 21/2 hour of reflux, unreacted 3,5-diphenyl-2-pyrazoline is found to amount to 2.4%, and a 76.4% yield of 3,5-diphenylpyrazole, melting at 198° - 201° C. is obtained.

Provenance & Evidence