Hydrochloric Acid → N-(2,6-Dimethylphenyl)-N′-(1-ethyl-2-pyrrolidinylidene)urea

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Reaction Steps

The hydrochloride of 1-ethyl-2-iminopyrrolidine (7.43 g.; 0.05 mole) is converted to free base (5.6 g.; 0.05 mole) in benzene in the usual manner. Then 7.35 g. (0.05 mole) of 2,6-dimethylphenylisocyanate, dissolved in anhydrous benzene, is added. The reaction mixture is stirred at room temperature for 1 3/4 hours and then the solvent is evaporated to dryness in vacuo to give an oily residue. Trituration with ethyl acetate and cooling produces a solid product, 1-(2,6-dimethylphenyl)-3-(1-ethyl-2-pyrrolidylidene)urea, m.p. = 120°-122° C. Recrystallization from acetone gives the pure product, m.p. - 121°-123° C.

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