Benzoins are oxidized to benzils in excellent yields by 0.4 equivalents of Bi(NO3)3.5H20 and 4 mol% of Cu(OAc)23)3.5H20 is a stable, inexpensive, commercially available solid. The relatively low cost and low toxicity of bismuth(Ill) nitrate makes this procedure a particularly attractive method for oxidation of benzoins.
Mohan, Ram; Tymonko, Steven; and Nattier, Bryce, "Oxidation of Benzoins to Benzils using Bismuth(III) Nitrate-Copper(II) Acetate" (1999). Scholarship. 52.