Please use this identifier to cite or link to this item: https://doi.org/10.1002/chem.200801776
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dc.titleZr-zeolite beta: A new heterogeneous catalyst system for the highly selective cascade transformation of citral to (±)-menthol
dc.contributor.authorNie, Y.
dc.contributor.authorJaenicke, S.
dc.contributor.authorChuah, G.-K.
dc.date.accessioned2014-10-16T08:47:42Z
dc.date.available2014-10-16T08:47:42Z
dc.date.issued2009-02-09
dc.identifier.citationNie, 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. https://doi.org/10.1002/chem.200801776
dc.identifier.issn09476539
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/95425
dc.description.abstractThe 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.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1002/chem.200801776
dc.sourceScopus
dc.subjectCyclization
dc.subjectHeterogeneous catalysis
dc.subjectHydrogenation
dc.subjectZeolites
dc.subjectZirconia
dc.typeArticle
dc.contributor.departmentCHEMISTRY
dc.description.doi10.1002/chem.200801776
dc.description.sourcetitleChemistry - A European Journal
dc.description.volume15
dc.description.issue8
dc.description.page1991-1999
dc.description.codenCEUJE
dc.identifier.isiut000263400200024
Appears in Collections:Staff Publications

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