Abstract
Nonionic tensioactive water-soluble phosphines that act as ligands for rhodium-catalyzed hydroformylation of higher olefins under aqueous-organic biphasic conditions are described with emphasis on the recycling efficiency of homogeneous catalyst. Phosphines discussed are P-[ p-C 6H 4(OCH 2CH 2) n OH] 3 (1a: N=3 n=18, 1b: N=3 n=25) and Ph 2P-[ p-C 6H 4(OCH 2CH 2) n OH] (2a: N= n=16, 2b: N= n=25) (PEO-TPPs). The rhodium catalyst combined with these ligands gave an average turnover frequency (TOF) of 182 h −1 for 1-hexene. More importantly, recovery and reuse of catalyst is possible because of the inverse temperature-dependent water solubility of the phosphines.
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