4-(Trifluoromethyl)phenyl isocyanate → HCID 18980935, compound

Participants

Reaction Conditions

Reaction Steps

To half of the ether solution of 3-(4-chlorophenyl)-4-(N-propyl-N-(2,2,2-trichloroethoxycarbonyl)-amino)-4,5-dihydro-1H-pyrazole (Example 349c) (≤149 mmole) was added 18.7 g (100 mmole) of 4-trifluoromethylphenyl isocyanate. After stirring for 30 minutes, the mixture was concentrated in vacuo and dissolved in 200 ml of 50/50 diethyl ether/hexanes and cooled to -20° C. Crystals of the desired compound formed and were filtered yielding 30 g of the desired compound, mp 172°-173° C.

Provenance & Evidence