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Novel α-fluorinated cyclic phosphite and phosphinite ligands and their Rh-complexes as suitable catalysts in hydroformylation |
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| Authors: | Irina Odinets,Tamá s Ké gl,Oleg Artyushin,Galina Molchanova,Tatyana Mastryukova,Gyö rgy Keglevich |
| Affiliation: | a A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Thiophosporous Laboratory, Vavilova Street, 28, Moscow 119991, Russian Federation b Research Group for Petrochemistry of the Hungarian Academy of Sciences, H-8200 Veszprém, Hungary c Institut fûr Anorganische & Physikalische Chemie, Universität Bremen, Germany d Department of Organic Chemical Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary e Department of Inorganic Chemistry, University of Pécs and Research Group for Chemical Sensors of the Hungarian Academy of Sciences, H-7624 Pécs, Hungary |
| Abstract: | Asymmetrical cyclic phosphite and phosphinite ligands of a novel type bearing either trifluoromethyl or pentafluorophenyl group were synthesized using >PCl or >PN< species and racemic fluorinated alcohols. The P-ligands were converted to complexes of RhIII(L)(Cp∗)Cl2 type (where L = phosphite or phosphinite) and, in two instances, their stereostructures were evaluated by X-ray analysis. These complexes along with in situ systems, formed from Rh(CO)2(acac) precursor and the corresponding ligand, were tested in the hydroformylation of styrene. Both systems provided excellent hydroformylation activities at 100 °C. Using the RhI in situ systems, moderate and high regioselectivities towards the branched aldehyde (2-phenyl-propanal) were obtained at 100 and 40 °C, respectively. |
| Keywords: | Cyclic phosphite- and phosphinite ligands Rhodium complexes Stereostructure Homogeneous catalysis Hydroformylation |
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