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The by-products which were occured in the synthesis of 5-ethyl-5-phenyl barbituric acid were isolated by column chromatography combined with gas-liquid chromatography and were identified by elemental analysis, ir, nmr and mass spectroscopy ; major by-products were ethyl${\alpha}$-phenylbutyrate and ${\alpha}$-phenylbutyramide. The alkoxide which was known to be a condensation agent not only accelerated the condensation but also did the decarboxylation. And the entity concenrned with the condensation with diethyl ethylphenylmalonate was not urea but N-monosodium urea.
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