Dr. Yong Yang, Dr. Eric G. Moschetta and Prof. Robert M. Rioux Addition of Sulfonic Acids to Terminal Alkynes Catalyzed by a Rhodium Complex: Ligand Concentration-Controlled Reaction Selectivity ChemCatChem 5
Trying to concentrate: The concentration of the exogenous phosphine ligand in the Rh-catalyzed hydrosulfonation of alkynes with sulfonic acids controls the selectivity of the final products. High concentrations of ligand lead to the formation of vinylphosphonium salts, whereas low concentrations of ligand lead to the formation of vinyl sulfonate esters. cod=1,5-cyclooctadiene, DCE=1,2-dichloroethane.
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