Yang Gui-qiu
2008
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Journal
Dyestuffs and coloration
Abstract
Sodium diethyl oxalacetate was prepared by Claisen condensation of diethyl oxalate with ethyl acetate. It condensed with phenyl hydrazine in the acid condition, and then cyclizated and acidified to prepare 1-phenyl-3-carbethoxy-5-pyrazolone. The structure of product was identified by IR and 1H-NMR.