Abstract
AbstractChiral 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)
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