Synthesis of Propylene Carbonate Catalyzed by Dawson-type Polyoxometalate

Abstract

Abstract: In the presence of Dawson-type polyoxotungstate, α 2-[(n-C₄H₉)₄]_(11-n)P₂W₁₇O ₆₁(M_n+·Br)[abbreviated as P₂W₁₇M·Br, M=Co(Ⅱ), Mn(Ⅲ), Cu(Ⅱ)] and saturated [(C₄H₉)₄N]₆P₂W₁₈O₆₂(abbreviated as P₂W₁₈), cycloaddition reaction of carbon dioxide to propylene oxide were studied under moderate reaction conditions without any additional organic solvents. The experimental results indicated that the synthesis of propylene carbonate was completed in 98% yield and 100% selectivity by using {P₂W₁₇Co·Br} as the catalyst, while the P₂W₁₈ complex showed the lowest catalytic activity with less than 1% yield of propylene carbonate. The dependency of the catalytic activity on transition metal of mono-substituted polyoxometalate, P₂W₁₇M·Br, as well as the nucleophilicity of the bromide ion was concluded from the process analysis.

Key words: Carbon dioxide, Propylene oxide, Propylene carbonate, Dawson polyoxometalate, Cycloaddition

CLC Number:

O641

TrendMD:

WANG Chun-Gang, JIANG Chun-Jie, HU Chang-Wen. Synthesis of Propylene Carbonate Catalyzed by Dawson-type Polyoxometalate[J]. Chem. J. Chinese Universities, 2004, 25(7): 1325.

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Synthesis of Propylene Carbonate Catalyzed by Dawson-type Polyoxometalate

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