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In this work, the two novel methods were achieved for the preparation of benzil derivatives  2a–f  with high yields and short reaction time from benzoins  1a–fvia ; (i) their refluxing with a mixture of sulfur and morpholine in ethanol, and (ii) their stirring with oxidizing agent “DMSO-NaBr-H 2 SO 4  system” at 85 °C. Thus, a new series of (5-oxo-4,4-diarylimidazolidin-2-ylidene)cyanamide  3a–f  was already synthesized from the reaction of benzils  2a–f  with commercially available cyanoguanidine in the presence of sodium ethoxide as a basic catalyst. The new products  3a–f  were exhibited promising antioxidant activity based on “ in vitro ” assays in 2,2-diphenyl-1-picrylhydrazyl (DPPH) compared to vitamin C.

Novel oxidation system of benzoins to benzils for synthesis and antioxidant activity studies of (5-oxo-4,4-diarylimidazolidin-2-ylidene)cyanamides