3-(Trifluoromethyl)phenyl isocyanate → HCID 54551796, compound

Participants

Reaction Steps

Conversion of the hydrochloride salt of 2-imino-1-methylpyrrolidine (6.73 g.; 0.05 mole) to the free base (4.9 g. assuming 100% conversion) is carried out in the usual manner. After drying over K2CO3, the benzene layer is stirred at room temperature and 9.36 g. (0.05 mole) of m-trifluoromethylphenylisocyanate is added (some solid precipitates). The reaction mixture is stirred overnight. The resulting solid is collected, m.p. = 155°-156° C. The benzene filtrate, upon removal of the solvent, affords an additional crop of solid material, m.p. 131°-137° C. Recrystallizations of the combined solids from acetone-pet. ether gives the pure product, 1-(1-methyl-2-pyrrolidylidene)-3-(m-trifluoromethylphenyl)urea, m.p. = 155°-156.5° C.

Provenance & Evidence