title: SUPRAPhos ligands for the regioselective rhodium catalyzed hydroformylation of styrene forming the linear aldehyde.
abstract: We report SUPRAphos-based rhodium catalysts that are unusually regioselective in the hydroformylation of styrene at low temperatures (40 degrees C) producing mainly the linear aldehyde (72%). This ligand-specific phenomenon is observed for two rhodium catalysts with heterobidentate phosphine-phosphoramidite ligands. We propose that the high selectivity for the linear product is caused by enhanced beta-hydride elimination, due to specific substrate-ligand interactions, most likely pi-pi interactions.
authors.affiliation: Homogeneous and Supramolecular Chemistry, Van't Hoff Institute for Molecular Sciences, Nieuwe Achtergracht 166, 1018 WV, Amsterdam, The Netherlands.
authors.forename: P Elsbeth
authors.initials: PE
authors.lastname: Goudriaan
authors.forename: Mark
authors.initials: M
authors.lastname: Kuil
authors.forename: Xiao-Bin
authors.initials: XB
authors.lastname: Jiang
authors.forename: Piet W N M
authors.initials: PW
authors.lastname: van Leeuwen
authors.forename: Joost N H
authors.initials: JN
authors.lastname: Reek