P-Toluic Acid → O,O'-Di-p-toluoyl-D-tartaric anhydride

Participants

Reaction Conditions

Reaction Steps

To a 300 ml reaction vessel equipped with a stirrer, thermometer, condenser and a dropping funnel, 30 g of D-tartaric acid, 70 g of toluene, 0.12 g of ferric chloride, 83.7 g of thionyl chloride and 59.9 g of p-toluic acid were supplied, and the mixture was heated to 90° C. under stirring for 3 hours. While keeping this temperature, the mixture was aged for another 4 hours and the resulting mixture was heated at 105°-110° C. for another 1 hour. The reaction mixture was then cooled to room temperature and the precipitated crystals were collected by filtration, followed by drying to obtain 67.7 g of O,O'-di-p-toluoyl-D-tartaric anhydride in the form of pale yellow crystals (purity: 100%, yield: 92.0%).

Provenance & Evidence