Tetrafluoroborate → 1-(1-Benzyl-2-pyrrolidylidene)-3-(2,6-dimethylphenyl)urea

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The fluoroborate salt of 1-benzyl-2-iminopyrrolidine (6.55 g.; 0.025 mole) is converted to free base (4.36 g; 0.025 mole) in the usual manner. After drying over K2CO3, the benzene solution is filtered through diatomaceous earth and 3.68 g. (0.025 mole) of 2,6-dimethylphenylisocyanate is added. The reaction mixture is stirred at room temperature for 1 hour and then evaporated to dryness in vacuo to give an oily residue of 1-(1-benzyl-2-pyrrolidylidene)-3-(2,6-dimethylphenyl)urea which is dissolved in ether and converted to the hydrochloride salt. Recrystallizations from methanol yields the product, 1-(1-benzyl-2pyrrolidylidene)-3-(2,6-dimethylphenyl)urea HCl, m.p. = 185°-195° C. (dec.) EXAMPLE XXXIV

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