Chiral Calix[4]arene-Based Diphosphites as Ligands in the Asymmetric Hydrogenation of Prochiral Olefins

Chiral Calix[4]arene-Based Diphosphites as Ligands in the Asymmetric Hydrogenation of Prochiral Olefins

Chiral calixarene‐based diphosphite ligands 3a–d have been obtained via lower‐rim functionalisation of the p‐tert‐butylcalix[4]arene core. High enantiomeric excesses (up to 94 %) and good activities were obtained in the rhodium‐catalyzed asymmetric hydrogenation of prochiral olefins withTADDOL‐conta...

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Veröffentlicht in:European Journal of Inorganic Chemistry 2007-10, Vol.2007 (29), p.4587-4591
Hauptverfasser: Marson, Angelica, Freixa, Zoraida, Kamer, Paul C. J., van Leeuwen, Piet W. N. M.
Format: Artikel
Sprache:eng
Schlagworte:
Asymmetric hydrogenation
Calixarenes
Diphosphites
Homogeneous catalysis
Stereoselective catalysis
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Zusammenfassung:Chiral calixarene‐based diphosphite ligands 3a–d have been obtained via lower‐rim functionalisation of the p‐tert‐butylcalix[4]arene core. High enantiomeric excesses (up to 94 %) and good activities were obtained in the rhodium‐catalyzed asymmetric hydrogenation of prochiral olefins withTADDOL‐containing diphosphites 3c,d. This is the firstexample of chiral calix[4]arene‐modified ligands that induce high enantioselectivity in metal‐catalysed asymmetric reactions.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.200700764