New catalysts for carboxylation of propylene glycol to propylene carbonate via high-throughput screening

New catalysts for carboxylation of propylene glycol to propylene carbonate via high-throughput screening

High throughput methodologies screened 81 different metal salts and metal salt combinations as catalysts for the carboxylation of propylene glycol to propylene carbonate, as compared to a 5 mol% Zn(OAc)2/p-chlorobenzene sulfonic acid benchmark catalyst. The reactions were run with added acetonitrile...

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Veröffentlicht in:Faraday discussions 2015, Vol.183, p.19-30
Hauptverfasser: Castro-Osma, José A, Comerford, James W, Heyn, Richard H, North, Michael, Tangstad, Elisabeth
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Comerford, James W
Heyn, Richard H
North, Michael
Tangstad, Elisabeth
description High throughput methodologies screened 81 different metal salts and metal salt combinations as catalysts for the carboxylation of propylene glycol to propylene carbonate, as compared to a 5 mol% Zn(OAc)2/p-chlorobenzene sulfonic acid benchmark catalyst. The reactions were run with added acetonitrile (MeCN) as a chemical water trap. Two new catalysts were thereby discovered, zinc trifluoromethanesulfonate (Zn(OTf)2) and zinc p-toluenesulfonate. The optimal reaction parameters for the former catalyst were screened. Zn(OTf)2 gave an overall propylene carbonate yield of greater than 50% in 24 h, twice as large as the previous best literature yield with MeCN as a water trap, with 69% selectivity and 75% conversion of propylene glycol at 145 °C and 50 bar CO2 pressure.
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title New catalysts for carboxylation of propylene glycol to propylene carbonate via high-throughput screening
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