Hydrochloric Acid → Allylethyl carbonate

Beteiligte Stoffe

Reaktionsschritte

A reactor equipped with a stirrer, thermometer and reflux condenser was charged with 469 g of allyl alcohol, 693 g of pyridine, and 1,200 g of THF. With stirring, 797 g of ethyl chlorocarbonate was added dropwise to the mixture while the internal temperature was controlled at −5° C. After the completion of dropwise addition, the reaction solution was aged at room temperature for 2 hours to complete the reaction. The reaction solution was neutralized with aqueous hydrochloric acid. This was combined with 1,000 ml of hexane and washed with water, whereupon the hexane layer was separated and dried over anhydrous sodium sulfate. The solution was precision distilled, collecting a fraction having a boiling point of 149-150° C. Allyl ethyl carbonate, 769 g, was obtained in a yield of 81%. It had a purity of 99.5% as analyzed by gas chromatography. On analysis by 1H-NMR in heavy chloroform, peaks appeared at 1.28 ppm (3H, t), 4.14 ppm (2H, q), 4.57 ppm (2H, d), 5.3 ppm (2H, m), and 5.9 ppm (1H, m). Also on analysis by 13C-NMR in heavy acetone, signals were observed at 14.4, 64.2, 68.4, 118.2, 133.2, and 155.5 ppm. On IR analysis, a strong signal of carbonyl radical was observed at 1748 cm−1. With these data, the product was identified to be allyl ethyl carbonate.

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