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A Self-Assembled Coodination Polymer as a Homo- and Heterogeneus Catalyst
J. I. García*, B. Lópes-Sánchez*, J. A. Mayoral*
CSIC-University of Zaragoza, Spain
22 January 2009 (online)
A new type of self-supported enantioselective catalysts, allowing a release-and-capture mechanism was described. The self-supported catalysts [t-BuDAX-Cu(OTf)2] and [t-BuDAX-CuOTf] were used to catalyze a cyclopropanation reaction of styrene with ethyl diazoacetate in dichloromethane. Both [t-BuDAX-Cu(OTf)2] and [t-BuDAX-CuOTf] coordination polymers were insoluble in dichloromethane and in a dichloromethane solution of styrene. However, as soon as the diazo compound was added to the reaction medium, the coordination polymer dissociated to give a clear homogeneous solution where the catalytic reaction took place. After completion of the reaction, the coordination polymer was again formed and appeared as a solid precipitate in the reaction medium.