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Issue 6, 2007
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Efficient synthesis of dimethyl carbonate from methanol, propylene oxide and CO2 catalyzed by recyclable inorganic base/phosphonium halide-functionalized polyethylene glycol

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Abstract

The cycloaddition of propylene oxide and CO2 to form propylene carbonate promoted by a phosphonium salt covalently bound to polyethylene glycol (PEG), and the transesterification of propylene carbonate with methanol to dimethyl carbonate (DMC) mediated by PEG-supported K2CO3, were separately investigated. Inorganic base/phosphonium halide-functionalized PEG (K2CO3/BrBu3PPEG6000PBu3Br) was shown to be active for DMC synthesis from propylene oxide, CO2 and methanol under mild reaction conditions, even under low CO2 pressure (2 bar). The effects of various reaction variables on the activity and selectivity performance are discussed in detail. The catalyst was readily separated and reused, without catalyst leaching being detected by 31P NMR. Notably, excellent yields of DMC and complete conversion of propylene carbonate were reached under the optimized reaction conditions. This procedure was successfully applied to the synthesis of other dialkyl carbonates.

Graphical abstract: Efficient synthesis of dimethyl carbonate from methanol, propylene oxide and CO2 catalyzed by recyclable inorganic base/phosphonium halide-functionalized polyethylene glycol

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Publication details

The article was received on 02 Oct 2006, accepted on 10 Nov 2006 and first published on 30 Nov 2006


Article type: Paper
DOI: 10.1039/B614259A
Citation: Green Chem., 2007,9, 566-571
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    Efficient synthesis of dimethyl carbonate from methanol, propylene oxide and CO2 catalyzed by recyclable inorganic base/phosphonium halide-functionalized polyethylene glycol

    J. Tian, C. Miao, J. Wang, F. Cai, Y. Du, Y. Zhao and L. He, Green Chem., 2007, 9, 566
    DOI: 10.1039/B614259A

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