Catalysts

Details Catalysts Catalysts

B - Operations, Transporting

01

J

B01J 31/16 (2006.01) B01J 20/32 (2006.01) B01J 31/02 (2006.01)

Patent

CA 2438117

A tethered ligand comprising the reaction product of an organofunctional silica and a ligand containing a functional group capable of reaction with said organofunctional silica, wherein the organofunctional silica is prepared from an alkyl silicate and an organofunctional silane is described. A supported catalyst is also described comprising additionally a source of catalytically-active metal. Methods for preparing the tethered ligand and supported catalyst are provided and uses of the supported catalyst for performing asymmetric reactions are claimed. The catalysts are readily separable from the reaction mixtures and may be re-used if desired.

Cette invention concerne un ligand captif comprenant le produit de réaction d'une silice organofonctionnelle et un ligand renfermant un groupe fonctionnel capable de réagir avec ladite silice organofonctionnelle, ladite silice étant obtenue à partir d'un silicate d'alkyle et d'un silane organofonctionnel. Est également décrit un catalyseur supporté comprenant en outre une source de métal actif au plan catalytique. L'invention concerne des procédés de préparation du ligand captif et du catalyseur supporté pour l'exécution de réactions asymétriques. Les catalyseurs peuvent être séparés facilement des mélanges de réaction et être réutilisés au besoin.

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