226957-34-2Relevant academic research and scientific papers
Investigation of the hydroformylation of ethylene in liquid carbon dioxide
Yonker, Clement R,Linehan, John C
, p. 249 - 257 (2007/10/03)
In situ, high-pressure NMR was used to investigate the hydroformylation reaction of ethylene in liquid CO2 using Rh(CO)2acac as the catalyst precursor and (p-CF3C6H4)3P, tris(p-trifluoromethylphenyl)phosphine, as the ligand under different thermodynamic conditions (T = 10-23 C, PCO = PH2 = 10-15 bar, PC2H4 = 10-15 bar, PCO2 = 207 bar). 1H-NMR was used to monitor the reaction progress of the hydroformylation of ethylene with a rhodium catalyst under select conditions of temperature and CO2 solvent pressure. Potential resting states of the rhodium catalyst were investigated by 31P(1H)-NMR. This is the first description of a rhodium catalyzed hydroformylation reaction in liquid CO2 monitored in situ by high pressure NMR.
Effect of Ligand Modification on Rhodium-Catalyzed Homogeneous Hydroformylation in Supercritical Carbon Dioxide
Palo, Daniel R.,Erkey, Can
, p. 81 - 86 (2008/10/08)
Several fluoroalkyl- and fluoroalkoxy-substituted tertiary arylphosphines were synthesized and investigated in the homogeneous catalytic hydroformylation of 1-octene using HRh-(CO)L3 (L = tertiary arylphosphine). The activity of the rhodium complex (formed in situ from Rh(CO)2(acac) and L) increased with decreasing basicity of the phosphine according to the series [3,5-(CF3)2C6H3]3P > [4-CF3C6H4]3P ≈ [3-CF3C6H4]3P > [4-CF3C6H4]3P > [4-F(CF2)4(CH2)3C6H 4]3P. The very weakly basic phosphine (C6F5)3P did not complex with Rh(CO)2(acac), most likely due to a combination of electronic and steric factors. Steric effects did not play a role in either the activity or selectivity of the rhodium catalysts that were formed under hydroformylation conditions.
