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Phosphonate‐Mediated Immobilization of Rhodium/Bipyridine Hydrogenation Catalysts
Author(s) -
Forato Florian,
Belhboub Anouar,
Monot Julien,
Petit Marc,
Benoit Roland,
SarouKanian Vincent,
Fayon Franck,
Jacquemin Denis,
Queffelec Clémence,
Bujoli Bruno
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201705283
Subject(s) - phosphonate , chemoselectivity , catalysis , rhodium , reactivity (psychology) , chemistry , bipyridine , ligand (biochemistry) , titanium , kinetics , polymer chemistry , combinatorial chemistry , stereochemistry , organic chemistry , crystal structure , medicine , biochemistry , physics , alternative medicine , receptor , pathology , quantum mechanics
RhL 2 complexes of phosphonate‐derivatized 2,2′‐bipyridine (bpy) ligands L were immobilized on titanium oxide particles generated in situ. Depending on the structure of the bipy ligand—number of tethers (1 or 2) to which the phosphonate end groups are attached and their location on the 2,2′‐bipyridine backbone (4,4′‐, 5,5′‐, or 6,6′‐positions)—the resulting supported catalysts showed comparable chemoselectivity but different kinetics for the hydrogenation of 6‐methyl‐5‐hepten‐2‐one under hydrogen pressure. Characterization of the six supported catalysts suggested that the intrinsic geometry of each of the phosphonate‐derivatized 2,2′‐bipyridines leads to supported catalysts with different microstructures and different arrangements of the RhL 2 species at the surface of the solid, which thereby affect their reactivity.