title: Rhodium complexes non-covalently bound to cyclodextrins: novel water-soluble supramolecular catalysts for the biphasic hydroformylation of higher olefins.
abstract: A new class of cationic alpha-cyclodextrins bearing 2-hydroxy-3-trimethylammoniopropyl groups has been synthesised. We investigated their efficiency as mass-transfer promoters in a biphasic hydroformylation reaction catalysed by a rhodium trisulfonated triphenylphosphine system. These cationic alpha-cyclodextrins greatly increased the reaction rate, the chemoselectivity, and, surprisingly, the linear-to-branched aldehyde ratio. We attributed this unexpected enhancement of the linear-to-branched aldehyde ratio to the in situ formation of new catalytic supramolecular species obtained by ion-exchange between the catalyst ligand and the cationic alpha-cyclodextrins.
authors.affiliation: Laboratoire de Physico-Chimie des Interfaces et Applications, FRE CNRS 2485, Université d'Artois, Faculté des Sciences Jean Perrin, Lens, France.
authors.forename: Benoît
authors.initials: B
authors.lastname: Sueur
authors.forename: Loïc
authors.initials: L
authors.lastname: Leclercq
authors.forename: Mathieu
authors.initials: M
authors.lastname: Sauthier
authors.forename: Yves
authors.initials: Y
authors.lastname: Castanet
authors.forename: André
authors.initials: A
authors.lastname: Mortreux
authors.forename: Hervé
authors.initials: H
authors.lastname: Bricout
authors.forename: Sébastien
authors.initials: S
authors.lastname: Tilloy
authors.forename: Eric
authors.initials: E
authors.lastname: Monflier