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5-Ethyl-1,3-dihydroxy-5-phenylbarbituric acid (N, N′-dihydroxyphenobarbital) and 5,5-diethyl-1,3- dihydroxybarbituric acid (N, N′-dihydroxyveronal) have been prepared by the condensation of 1,3-dibenzyloxyurea with ethylphenylmalonyl dichloride and diethylmalonyl dichloride respectively, followed by the removal of the benzyl protecting groups from the intermediate dibenzyloxy derivatives.

Pyrimidine N-oxides. IV. The N,N'-dihydroxy derivatives of phenobarbital and veronal