Another preparation, performed by dimerization of benzaldehyde, to benzil, which is transformed to the product by the benzilic acid rearrangement reaction.
2.
The final step is a benzilic acid rearrangement from a 1, 2-diketone ( 1, 5, 6-trihydroxyhexane-2, 3-dione ) which is formed from the carbohydrate.
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