Abstract
The title compound, C7H11NO4, is a useful precursor in the synthesis of substituted pyrimidine bases. It is prepared from diketene and urethane and can be isolated from benzene as colorless, transparent, plate crystals. The H atom of the secondary amide forms centrosymmetric planar dimers with the carbonyl group of a second symmetry-related molecule. The ketone carbonyl of the β-keto amide is present as the keto tautomer and not as the enol. The r.m.s. deviation of the atoms in the hydrogen-bonded dimer from the least-squares plane defined by those atoms is 0.014 A.
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