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Title: Cyclisation of citronellal over zirconium zeolite beta - A highly diastereoselective catalyst to (±)-isopulegol
Authors: Yongzhong, Z.
Yuntong, N. 
Jaenicke, S. 
Chuah, G.-K. 
Keywords: (±)-Isopulegol
Fluoride-assisted synthesis
Solvent effect
Zr-zeolite beta
Issue Date: 25-Jan-2005
Citation: Yongzhong, Z., Yuntong, N., Jaenicke, S., Chuah, G.-K. (2005-01-25). Cyclisation of citronellal over zirconium zeolite beta - A highly diastereoselective catalyst to (±)-isopulegol. Journal of Catalysis 229 (2) : 404-413. ScholarBank@NUS Repository.
Abstract: The catalytic cyclisation of citronellal was studied over Zr-zeolite beta, micro/mesoporous Al-MSU-SFAU, and microporous HY catalysts. All samples showed good activity in the cyclisation of citronellal to form isopulegols with >97% selectivity. A high diastereoselectivity for (±)-isopulegol of ∼93% was observed over Zr-zeolite beta, whereas Al-MSU-SFAU and HY showed a lower selectivity of ∼65%. Zr-zeolite beta was synthesised in a range of Si/Zr of 75-200 with the use of fluoride and zeolite beta seeds. Zeolite beta with Al and Ti substitution was less active and selective than Zr-zeolite beta. The rate of reaction strongly depended on the type of solvent used, but the reaction could also be carried out without any solvent. A hydroxylated surface is important for good activity. This is consistent with the proposed mechanism, where both Lewis and Brønsted acid sites are essential for the reaction. © 2004 Elsevier Inc. All rights reserved.
Source Title: Journal of Catalysis
ISSN: 00219517
DOI: 10.1016/j.jcat.2004.11.015
Appears in Collections:Staff Publications

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