Sodium Hydroxide → alpha-[[[(2,4-Dioxo-1-imidazolidinyl)amino]carbonyl]amino]benzene acetic acid

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Reaction Steps

29.4 g. of α-[[[(2,4-dioxo-1-imidazolidinyl)amino]-carbonyl]amino]benzeneacetic acid, ethyl ester are added to 138 ml. of 2N sodium hydroxide solution with stirring. The substance goes quickly into solution upon slight heating. The mixture is stirred for 2 hours at room temperature, filtered and the clean filtrate is acidified to pH 1 with concentrated hydrochloric acid. Upon rubbing, α-[[[(2,4-dioxo-1-imidazolidinyl)amino]carbonyl]amino]benzene acetic acid crystallizes out. The mixture is let stand in the refrigerator overnight and then filtered under suction, yield 21.9 g., m.p. 139°-143°.

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