Trispyrazolylborate Ligands Supported on Vinyl Addition Polynorbornenes and Their Copper Derivatives as Recyclable Catalysts |
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| Authors: | Dr Jesús A Molina?de?la?Torre Ignacio Pérez-Ortega Dr Álvaro Beltrán Manuel R Rodríguez Prof?Dr M Mar Díaz-Requejo Prof?Dr Pedro J Pérez Prof?Dr Ana C Albéniz |
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| Institution: | 1. IU CINQUIMA/Química Inorgánica, Universidad de Valladolid, 47071 Valladolid, Spain;2. Laboratorio de Catálisis Homogénea, Unidad Asociada al, CSIC CIQSO-Centro de Investigación en Química Sostenible, Departamento de Química, Universidad de Huelva, 21007- Huelva, Spain |
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| Abstract: | Polynorbornenes prepared by vinyl addition polymerization and bearing pendant alkenyl groups serve as skeletons to support trispyrazolylborate ligands (Tpx) built at those alkenyl sites. Reaction with CuI in acetonitrile led to VA-PNB–TpxCu(NCMe) (VA-PBN=vinyl addition polynorbornene) with a 0.8–1.4 mmol incorporation of Cu per gram of polymer. The presence of tetracoordinated copper(I) ions was been assessed by FTIR studies on the corresponding VA-PNB-TpxCu(CO) adducts, in agreement with those on discrete TpxCu(CO). The new materials were employed as heterogeneous catalysts in several carbene- and nitrene-transfer reactions, showing a behavior similar to that of the homogeneous counterparts but also being recycled several times maintaining a high degree of activity and selectivity. This is the first example of supported Tpx ligands onto polymeric supports with catalytic applications. |
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| Keywords: | carbene transfer copper nitrene transfer polynorbornenes supported catalysts |
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