Please use this identifier to cite or link to this item:
https://scholarbank.nus.edu.sg/handle/10635/77387
DC Field | Value | |
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dc.title | Zr-zeolite beta: A new heterogeneous catalyst system for the highly selective cascade transformation of citral to (±)-menthol | |
dc.contributor.author | Nie, Y. | |
dc.contributor.author | Jaenicke, S. | |
dc.contributor.author | Chuah, G.-K. | |
dc.date.accessioned | 2014-06-23T05:54:24Z | |
dc.date.available | 2014-06-23T05:54:24Z | |
dc.date.issued | 2009-02-09 | |
dc.identifier.citation | Nie, Y., Jaenicke, S., Chuah, G.-K. (2009-02-09). Zr-zeolite beta: A new heterogeneous catalyst system for the highly selective cascade transformation of citral to (±)-menthol. Chemistry - A European Journal 15 (8) : 1991-1999. ScholarBank@NUS Repository. | |
dc.identifier.issn | 09476539 | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/77387 | |
dc.description.abstract | The transformation of citral to menthols involves hydrogénation steps as well as cyclisation of the intermediate, citronellal. The ability of Zrzeolite beta to catalyse the cyclisation with high diastereoselectivity to (±)-isopulegol is the critical step in this cascade transformation. Bifunctional catalysts containing nickel or rhodium supported on Zr-zeolite beta gave menthols in yields of 87-89 % and an excellent diastereoselectivity of 94% for the desired (±)-menthol. Dual catalyst systems of Zr-zeolite beta and nano-dispersed Ni on an MCM-41 support were equally effective and have the added advantage that the rates of the acid and hydrogenation-catalysed steps can be independently varied. By applying a pressure ramp of 0.2-2 MPa, the yield of menthols could be increased to 95 %, with 94 % diastereoselectivity for (±)-menthol. The low initial pressure minimises the rates of competing hydrogenation reactions to byproducts such as citronellol and 3,7-dimethyloctanol. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA. | |
dc.description.uri | http://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1002/chem.200801776 | |
dc.source | Scopus | |
dc.subject | Cyclization | |
dc.subject | Heterogeneous catalysis | |
dc.subject | Hydrogenation | |
dc.subject | Zeolites | |
dc.subject | Zirconia | |
dc.type | Article | |
dc.contributor.department | CHEMISTRY | |
dc.description.sourcetitle | Chemistry - A European Journal | |
dc.description.volume | 15 | |
dc.description.issue | 8 | |
dc.description.page | 1991-1999 | |
dc.description.coden | CEUJE | |
dc.identifier.isiut | 000263400200024 | |
Appears in Collections: | Staff Publications |
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