Epoxidation of alkenes with tungsten catalysts immobilised on organophosphoryl macroligands |
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| Institution: | 1. Université de Toulouse, Institut de Mathématiques de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France;2. CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France;1. Instituto de Telecomunicações and Department of Electrical and Computer Engineering, University of Coimbra, 3030-290, Coimbra, Portugal;2. Instituto Superior Técnico—University of Lisbon, Avenida Rovisco Pais, 1, 1049-001 Lisboa, Portugal;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122, Luoshi Road, Wuhan 430070, China;2. School of Materials Science and Technology, South China University of Technology, 381 Wushan Road, Guangzhou 510640, China;3. Laboratory of Inorganic Materials Chemistry (CMI), University of Namur, 61, rue de Bruxelles, B-5000 Namur, Belgium;4. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA |
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| Abstract: | Organophosphorus ligands when grafted onto porous polymers are able to complex with peroxotungstic acid to give immobilised catalytic species for the epoxidation of alkenes with hydrogen peroxide. The macroligands described here contain the phosphoryl (OP) subunit and are related to phosphine oxides R3PO, phosphonic, phosphinic or phosphoric acid amides RP(O)(NRR)2, RR>P(O)NR2 and PO(NR2)3, respectively. These different ligands were introduced in hydrophobic polystyrene and hydrophilic polymethacrylate resins of gel- or macroporous type. This allowed the study of the influence induced on the reactivity and on the selectivity of the epoxidation by the nature of the ligand and by the polar environment around the catalytic sites inside the polymeric beads. |
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