C-urea condensation with malonic ester to form barbituric acid
and directly oxidization of it by chromium oxide. The yield of two steps was 50%. The chemical and radiochemical purities of Alloxan assessed by paper chromatography were over than 95%. The specific activity of barbituric acid was 2.84 mCi/mmol and that of Alloxan was 2.46 mCi/mmol.
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references
M. L. Tomayo et al ., Chem. Abstr. 48 , 1278d ( 1952 ).