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The catalyst systems composed of ZnBr 2 and different phosphonium salts were examined for solvent-free synthesis of cyclic carbonates from CO 2 and terminal epoxides under mild conditions. Among the catalysts investigated, ZnBr 2 –Ph 4 PI was found to be the best while those of ZnBr 2 –phosphine oxide (Bu 3 PO or Ph 3 PO) show no catalytic effect...
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