4-Chlorophenyl Isocyanate → N,3-Bis(4-chlorophenyl)-4-phenyl-4,5-dihydro-1H-pyrazole-1-carboxamide

Participants

Reaction Steps

In a 500 ml round bottomed flask was suspended 55 g of 3-(4-chlorophenyl)-4-phenyl-4,5-dihydro-1H-pyrazole in 250 ml of diethyl ether. The suspension was warmed to reflux and 33 g of 4-chlorophenyl isocyanate was added at a rate to maintain reflux. After cooling and standing overnight the precipitated product was filtered yielding 78 g of white solid. mp 173°-175° C.

Provenance & Evidence