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These catalysts are based on phosphonium salts containing an alcohol moiety in the side chain for substrate activation through hydrogen bonding. In the model reaction, converting 1,2\u2010butylene oxide with CO<jats:sub>2<\/jats:sub>, 19 catalysts were tested to determine structure\u2013activity relationships. In total, 28 epoxides were converted with CO<jats:sub>2<\/jats:sub> to give the respective cyclic carbonates in yields of up to 99\u2009%. Even at 45\u2009\u00b0C, the most active catalyst was able to produce cyclic carbonates selectively in high yields. The carbonates were generally obtained as analytically pure products after simple filtration over silica gel. 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