期刊
GREEN CHEMISTRY
卷 11, 期 8, 页码 1227-1231出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b823297k
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资金
- NSFC [20573104]
- CAS
A clean process has been developed for the synthesis of p-menthane-3,8-diols from cyclization of citronellal in CO(2)-H(2)O medium without any additives. With the addition of CO(2), the reaction rate could be enhanced about 6 times for the cyclization of citronellal in H(2)O, because CO(2) dissolved into water and formed carbonic acid inducing an increase of the acidity. Although, the reaction conversion in CO(2)-H(2)O is slightly lower compared to that obtained with sulfuric acid as catalyst, CO(2)-H(2)O could replace the sulfuric acid at a relative higher reaction temperature. The reaction kinetics studies showed that the hydration of isopulegols to p-menthane-3,8-diols is a reversible reaction. The equilibrium constant and the maximum equilibrium yield obtained in CO(2)-H(2)O at a range of CO(2) pressures are similar to that with sulfuric acid catalyst.
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