Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 304, Issue 1-2, Pages 147-152Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2009.02.005
Keywords
Verkade base; Dimethyl carbonate; Propylene carbonate; Transesterification; Kinetics
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The co-generation of dimethyl carbonate (potential fuels additive, environmentally friendly replacement for more toxic methylating agents, etc.) and propylene glycol via the transesterification reaction of propylene carbonate and methanol was studied using base catalysis. Verkade Super bases (proazaphosphatranes) proved especially effective at low catalyst loadings (0.5%) for the rapid transesterification of propylene carbonate with methanol under mild conditions and with high product selectivity (typically >99.5%). These bases neatly avoid the use of alkoxide catalysts which generate by-products in their neutralisation. The kinetics of the reactions were studied using data obtained from in situ NMR reaction monitoring. The influences of several reaction optimisation parameters are also dealt with. (C) 2009 Elsevier B.V. All rights reserved.
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