کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
43849 | 45991 | 2006 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: One pot selective hydrogenation and dynamic kinetic resolution over Cu/Al2O3: A way to (−)-menthol starting from low value mint oils One pot selective hydrogenation and dynamic kinetic resolution over Cu/Al2O3: A way to (−)-menthol starting from low value mint oils](/preview/png/43849.png)
Different Cu catalysts have been used for the hydrogenation of very low value mint oils, namely, dementholized cornmint oil and Spanish pennyroyal oil.During the hydrogenation of dementholized oil Cu/Al2O3 showed the best activity and selectivity towards a mixture of menthols, while stereoselectivity toward the valuable isomer (−)-menthol can be improved by selectively dehydrogenating the products mixture.In the hydrogenation of pulegone and pennyroyal oil Cu/Al2O3 showed an unprecedented activity allowing complete transformation of the substrate into menthols under very mild experimental conditions (1 atm H2, 90 °C). Moreover, a dynamic kinetic resolution process taking place during the hydrogenation step, allows to enrich the mixture in (−)-menthol.
One pot selective hydrogenation of (+)-pulegone to menthols can be obtained by using a heterogeneous copper catalyst under very mild experimental conditions. Stereoselectivity to (−)-menthol can be improved from 23 to 41% by exploiting a dynamic kinetic resolution over the same catalyst in a one pot-one step process. Figure optionsDownload as PowerPoint slide
Journal: Applied Catalysis A: General - Volume 315, 23 November 2006, Pages 114–119