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Abstract
Efficient oxidation of benzoins to corresponding benzils using chromic acid supported on aluminum silicate reagent under viscous conditions at room temperature is described, and all the reactions are completed within 3 hours in yields between 82–92%. The present procedure can overcome the problems existed in the common solvent-free reactions of the difficulty for the solid molecular collision to react. In addition, owing to the reaction using a very minimum amount of solvents, combustion, toxicity, and environmental pollution of the solvents are quite reduced.