The optically pure Rh(I)-diphosphine complexes [((R)-(R)-BDPBzPSO3)Rh(nbd)] (1), [((+)-DIOP)Rh(nbd)]OTf (2), and [((S)-BINAP)Rh(nbd)]OTf (3) have been tethered to silica via hydrogen-bonding interaction of isolated silanols with a sulphonate group in either the chiral ligand or the counteranion. A preliminary study of the potential of the resulting supported hydrogen-bonded (SHB) catalysts in the heterogeneous enantioselective hydrogenation of prochiral olefins is reported.
Immobilization of optically active rhodium-diphosphine complexes on porous silica via hydrogen bonding
GOBETTO, Roberto;
2001-01-01
Abstract
The optically pure Rh(I)-diphosphine complexes [((R)-(R)-BDPBzPSO3)Rh(nbd)] (1), [((+)-DIOP)Rh(nbd)]OTf (2), and [((S)-BINAP)Rh(nbd)]OTf (3) have been tethered to silica via hydrogen-bonding interaction of isolated silanols with a sulphonate group in either the chiral ligand or the counteranion. A preliminary study of the potential of the resulting supported hydrogen-bonded (SHB) catalysts in the heterogeneous enantioselective hydrogenation of prochiral olefins is reported.
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