A catalyst system consisting of supported palladium in the presence of phosphine ligands, TsOH and LiCl catalyses the carbonylation of 1-arylethanols to 2-arylpropionic acids with significantly improved activity and regioselectivity; the catalyst can be recycled with no loss in activity and selecivity.
Jayasree, S., A. Seayad, and R. V. Chaudhari. "Highly Active Supported Palladium Catalyst for the Regioselective Synthesis of 2-arylpropionic Acids by Carbonylation." Chemical Communications Chem. Commun. 12 (1999): 1067-068. http://dx.doi.org/10.1039/A902541C
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