Method for synthesizing levocarnitine by taking D-(-)-tartaric acid as raw material
A technology of tartaric acid and dibenzyl tartrate, applied in chemical instruments and methods, preparation of organic compounds, chemical recovery, etc., to achieve the effects of low cost, mild reaction conditions, and simple process technology
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[0050] Synthesis of D-(-)-dibenzyl tartrate:
[0051] Add 45g of D-(-)-tartaric acid, 2.25g of boric acid, 90ml of benzyl alcohol and 120ml of toluene solution into a 500ml three-necked flask. Toluene is the water-carrying agent. Stir and heat up until all the solids are dissolved, then heat up to reflux, and reflux at 116°C Divide the water, react until the water volume in the water separator no longer increases, record the water division. After cooling to room temperature, pour the reaction solution into a separatory funnel, add an equal volume of saturated NaHCO3 solution to wash until no bubbles are formed, and then wash the oil layer with distilled water for 2 to 3 times, let it stand for layers, and use anhydrous magnesium sulfate to treat the ester layer. Carry out drying, leave standstill overnight, filter, and filtrate is poured into distillation bottle and carries out normal pressure distillation, removes toluene, then decompression distillation removes benzyl alcoho...
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