Shi Xiao-xin
2005
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Journal
Fine Chemical Intermediates
Abstract
The processes for syntheses of L-dibenzoyltartaric acid and L-diacetyltartaric acid were studied. The Lewis acid catalyzed reaction of L-tartaric acid with benzoyl chloride in the presence of thionyl dichloride in toluene gave smoothly L-dibenzoyltartaric anhydride that was then treated with water to afford L-dibenzoyltartaric acid. Its total yield and optical rotation was 86% and 99%, respectively. The reaction of L-tartaric acid with acetic anhydride in the presence of catalytic amount of sulfuric acid gave L-diacetyltartaric anhydride that was then treated with water in acetone to afford diacetyltartaric acid, and its total yield and optical rotation was 75% and 99%, respectively.