1-Chloro-4-isocyanato-2-(trifluoromethyl) benzene → HCID 54394264, compound

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Reaction Steps

The hydrochloride salt of 2 -imino-1 -methylpyrrolidine (6.73 g; 0.05 mole) is converted to free base by adding 5 ml. of 50 % NaOH and extracting into benzene. After drying over K2CO3, the benzene solution is stirred at room temperature and 11.08 g. (0.05 mole) of 3-trifluoromethyl- 4-chlorophenylisocyanate [prepared according to the method of K. Inukai and Y. Maki, Kogyo Kagaku Zasski, 70 (4), 491-4 (1967)] dissolved in about 50 ml. of anhydrous benzene is added dropwise to this solution. After one-half of the amount is added cloudiness occurs and then solid precipitates. The mixture is stirred at room temperature overnight. The solid is collected, 1-(4-chloro-3-trifluoromethylphenyl)-3-(1-methyl-2 -pyrrolidylidene)urea, and recrystallizations from ethyl acetate yields the pure product, m.p. = 175° C.

Provenance & Evidence