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A dimeric Cr(salen) catalyst was successfully immobilised in a silica-supported ionic liquid. The heterogeneous catalyst offers very high selectivity and good reactivity for asymmetric ring-opening reactions of epoxides. It can be used in a continuous-flow reactor as an alternative for the homogeneous reaction.
When reactions take place in ionic liquids, a solvent is normally used to extract the products after reaction. It is reported here how the presence of the solvent during the reaction already can seriously improve the catalytic performance. Above all, employing water as the added solvent enhanced the catalytic activities significantly, ascribed to the creation of a well mixed ‘emulsion-like’ system...
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