Abstract
A water-soluble phosphonate-functionalized phosphine ligand Na 2[Ph 2P(CH 2) 12PO 3] ( 8), was prepared in eight steps from cyclododecanone. Phosphine 8 reacts with [Rh(COD)Cl] 2 in methanol to give the new complex Na 2[Rh(COD)(Ph 2P(CH 2) 12PO 3)Cl] ( 9). Complex 9 is inactive in the catalytic hydrogenation of 1-hexene and cyclohexene due to the decomposition of 9 to rhodium metal in the presence of hydrogen gas. Hydrogenation of decene using [Rh(COD) 2]BF 4 and 3 equiv. of 8 in an aqueous emulsion was achieved using 1 atm H 2. 31P NMR studies on 8 suggest a lack of well-defined aggregation in water, which has been ascribed to the steric bulk of the diphenylphosphino group.
Published Version
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