S. Stavchansky, H. Kostenbauder
Oct 1, 1972
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Journal
Journal of Labelled Compounds and Radiopharmaceuticals
Abstract
The condensation of 1 or 3 [14C] n-butylmalonate diethyl ester (III) with hydrazobenzene (IV) yields up to 90 per cent of 3 or 5 [14C] 4-butyl-1, 2-diphenyl-3, 5-pyrazolidinedione, if n-butyl alcohol is used as a solvent and the corresponding sodium alcoholate as a condensing agent (1, 2). One or three [14C] n - butylmalonate diethyl ester can be synthesized by condensation of n-bromobutane (II) and 1 [14C] ethyl malonate (I) in the presence of sodium ethoxide (3).