558466-67-4Relevant academic research and scientific papers
Hydridorhodium(I) complexes with amphiphilic polyether phosphines. NMR study and biphasic hydroformylation of 1-octene
Solsona, Antoni,Suades, Joan,Mathieu, René
, p. 172 - 181 (2003)
The formation of hydridorhodium(I) complexes with the amphiphilic phosphines was studied by NMR methods and IR spectroscopy. Two approaches were used: (1) the substitution reaction of triphenylphosphine in RhH(CO)(PPh3)3 by an amphiphilic phosphine and (2) a reaction between the precursor Rh(acac) (CO)2, syngas and the amphiphilic ligand in hydroformylation reaction conditions. Both approaches show the formation of P-coordinated hydridorhodium(I) complexes, and no relevant chelated (P, O) complexes were recognised. The biphasic rhodium-catalysed hydroformylation of 1-octene with the following water-soluble amphiphilic phosphines was studied: 4-(R)C6H4 (OCH2CH2)nP(Ph)CH2CH 2SO3Na (R = 2,2,4,4-tetramethylbutyl, n? = 1.4, 5.1, 11.2, R = n-nonyl, n? = 1.6, 5.6, 11.4), and RP(Ph)CH2CH2SO3Na (R = n-octyl, CH3(OCH2CH2) 2OCH2CH2). Ligands with a hydrophobic group and a short polyether chain led to the higher conversion. This result is ascribed to the ability of these ligands to increase the metal concentration in the organic phase.
