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Cite this: Dalton Trans., 2012, 41, 13533
PAPER
Rhodium complexes stabilized by phosphine-functionalized phosphonium
ionic liquids used as higher alkene hydroformylation catalysts: influence of
the phosphonium headgroup on catalytic activity†‡
Kylie L. Luska, Karl Z. Demmans, Samantha A. Stratton and Audrey Moores*
Received 7th August 2012, Accepted 13th September 2012
DOI:
Monodentate phosphine-functionalized phosphonium ionic liquids (PFILs) were employed as ligands
for Rh complexes and used in the hydroformylation of higher alkenes. Three PFILs were designed by
varying the length of the P-alkyl chain attached to the phosphonium moiety, for alkyl = methyl (1), butyl
(2), octyl (3), in order to tune their solubility properties. In all PFILs, the phosphonium unit is linked to
a diphenylphosphino functionality by an undecyl linker, with bis(trifluoromethylsulfonyl)imide as
counter anion. These PFILs were combined with a Rh(I) precursor, [Rh(acac)(CO)2], to prov
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