519039-38-4Relevant articles and documents
A novel dicationic phenoxaphosphino-modified xantphos-type ligand: A ligand for highly active and selective, biphasic, rhodium catalysed hydroformylation in ionic liquids
Bronger, Raymond P.J.,Silva, Silvana M.,Kamer, Paul C.J.,Van Leeuwen, Piet W.N.M.
, p. 1590 - 1596 (2004)
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.
