Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 29, Pages 4587-4591Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.200700764
Keywords
homogeneous catalysis; stereoselective catalysis; asymmetric hydrogenation; calixarenes; diphosphites
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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 with TADDOL-containing diphosphites 3c,d. This is the first example of chiral calix[4]arene-modified ligands that induce high enantioselectivity in metal-catalysed asymmetric reactions.
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