Boric Acid Catalytic Synthesis of Dibenzyl L-Tartrate

With tartaric acid and benzyl alcohol as raw material for synthesis of dibezyl L-tartrate. The specific rotator power is determined with toluene as solvent and boric acid as a catalyst. The structure of the product is confirmed by IR. The optimized conditions are as follows : the dosage of boric acid is 0. 75 g,the reaction time is 4h,the amount of carbon tetrachloride is 40 ml,the molar ratio of acid to alcohol is 1 2. 8,specific rotation is + 5. 325,83. 57% of the receiving rate reached and boric acid can be reused many times.