A novel dicationic phenoxaphosphino-modified xantphos-type ligand: A ligand for highly active and selective, biphasic, rhodium catalysed hydroformylation in ionic liquids
A highly active and regioselective catalyst obtained from a novel dicationic ligand (1) and Rh(CO)2(acac) for hydroformylation of 1-hexene and 1-octene in ionic liquids is reported. Optimisation studies of various reaction parameters led to an unprecedentedly active (TOFs > 6200 mol mol-1 h-1, T = 100°C), selective (1/b ratios > 40) and stable hydroformylation procedure. No catalyst leaching (Rh-loss 0.07% of initial rhodium intake, P-loss 0.4% of the initial phosphorus intake) or losses in performance could be measured during 1-octene hydroformylation recycle experiments in 1-butyl-3-methylimidazolium hexafluorophosphate. At low catalyst loadings activities and regioselectivities competitive with one-phase catalysis in conventional solvents were observed. At high catalyst loadings the system is extremely stable and has a long shelf-life as a result of the formation of stable, if inactive rhodium dimers.
Bronger, Raymond P.J.,Silva, Silvana M.,Kamer, Paul C.J.,Van Leeuwen, Piet W.N.M.
A novel dicationic phenoxaphosphino-modified Xantphos-type ligand - A unique ligand specifically designed for a high activity, selectivity and recyclability
A novel phenoxaphosphino-modified ligand has been prepared and successfully employed in the rhodium catalysed hydroformylation of 1-octene in ionic liquids showing unprecedented high selectivity and activity without detectable rhodium or phosphorus leaching during recycling experiments.
Bronger, Raymond P. J.,Silva, Silvana M.,Kamer, Paul C. J.,Van Leeuwen, Piet W. N. M.
p. 3044 - 3045
(2007/10/03)
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