251955-76-7Relevant academic research and scientific papers
Rhodium cationic complexes using macrocyclic diphosphines as chiral ligands: Application in asymmetric hydroformylation
Pamies, Oscar,Net, Gemma,Widhalm, Michael,Ruiz, Aurora,Claver, Carmen
, p. 136 - 143 (2007/10/03)
The mononuclear complexes [Rh(COD)(OCnP)]BF4 were prepared by adding 1,1′-binaphthyl-based diphosphine macrocyclic ligands (OCnP, n=4-6) to a dichloromethane solution of [Rh(COD)2]BF4 (COD=1,5-cyclooctadiene). Hydroformylation of styrene was carried out using solutions of rhodium-diphosphine catalyst prepared from [Rh(acac)(CO)2] and chiral macrocyclic diphosphines OCnP, n=2, 4-6. At 30 bar of CO/H2 (1:1) and 65°C regioselectivities in 2-phenylpropanal were >92% when all the chiral diphosphine was added in a P-P/Rh ratio of 2. The solution structure of the dominant species formed during the reaction of [Rh(acac)(CO)2] with (rac)-OC6P under hydroformylation conditions has been determined.
