Krishna Damodaran - Recyclable Dirhodium Catalysts Embedded in Nanoporous Surface

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ChemCatChem, 2010, 2, 1461


  Recyclable and efficient heterogeneous catalysts have been   prepared by embedding dirhodium(II,II) core carboxylate complexes   into the amine-functionalized nanosized channels of a mesoporous   silica host, amine–SBA-15. Two alternative synthetic procedures   for the preparation of the catalysts have been developed and   adapted for the immobilization of dirhodium complexes of variable   Lewis acidity. The catalytic activity of the resulting solid   materials has been evaluated in model cyclopropanation reactions   of styrene at variable reaction conditions (reaction substrate,   temperature, time, and solvent). Importantly, the designed   catalysts, which can be readily recovered and reused, display the   reactivity and selectivity profiles exceeding or comparable to   their homogeneous dirhodium(II) counterparts.

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