Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/34145
Title: Controlling the selectivity of the manganese/bicarbonate/hydrogen peroxide catalytic system by a biphasic pyrrolidinium ionic liquid/n-heptane medium
Authors: Wong, WL
Ho, KP
Lee, LYS 
So, MH
Chan, TH 
Wong, KY 
Keywords: Green chemistry
Hydrogen peroxide
Ionic liquid
Manganese catalyst
Oxidation
Issue Date: 2013
Source: Applied catalysis A : General, 2013, v. 453, p. 244-249 How to cite?
Journal: Applied Catalysis A: General 
Abstract: The Mn2+/HCO3-/H2O2 catalytic system exhibits excellent aldehyde selectivity in the oxidation of various benzylic and allyic alcohols under mild conditions and short reaction time when the reactions are carried out in a biphasic dicationic pyrrolidinium ionic liquid/n-heptane medium. The dicationic pyrrolidinium ionic liquid shows differential solubility towards alcohols and their aldehydes whereas the immiscible n-heptane instantaneously extracted and separated aldehydes from the reaction phase. This design of biphasic ionic liquid/n-heptane catalytic system prevents the over-oxidation of aldehydes to carboxylic acids effectively. Separation and recycling can also be easily done by decantation of the n-heptane layer after reaction. With the biphasic system, high conversion of benzyl alcohol to benzaldehyde was achieved with very low loadings of H 2O2 and Mn(OAc)2 catalyst at room temperature and within short reaction time. Throughout 10 reaction cycles, a total turnover number (TON) of 37,600 was achieved and excellent catalytic reactivity and selectivity were maintained with an average yield of 94%.
URI: http://hdl.handle.net/10397/34145
ISSN: 0926-860X
DOI: 10.1016/j.apcata.2012.12.026
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