By Dirk De Vos, Ivo F. J. Vankelecom, Pierre A. Jacobs
Homogeneous uneven catalysis bargains trustworthy effects and the chance to 'tune' the catalysis on a rational foundation. A pitfall, even if, is that the separation of the catalyst from the beginning fabric and items is hard and sometimes ends up in the lack of the catalytic fabric. Immobilization deals a possible resolution for the consumer of enantioselective catalysts in business strategies and laboratories. Heterogeneous catalysis permits non-stop operations, recycling of the catalyst, and a straightforward separation of the response items, decreasing either waste and prices. Chemists in academia and will welcome this cautious choice of themes during this guide that gives readers with functional and exact information regarding the technical standards for the immobilization of chiral catalysts, their program in synthesis, and strategies for recycling.
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Extra info for Chiral Catalyst Immobilization and Recycling (Wiley-Vch)
E. of the heterogenized system was higher than that of the homogeneous analog. An enhanced stability of the Cr-complex upon immobilization or a unique spatial environment constituted by both the chiral binaphtyl Schiff base ligand and the surface of the support, were given as tentative explanations. 2 Adsorption or Ion-Pair Formation The easy preparation of these systems is a clear advantage, but their sensitivity to solvent effects is an important drawback. Charges were created on silica via reaction with a SO;-terminated silylating agent (Fig.
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The lower activities can be due to reduced or even blocked mass transport in the small pores, imposing limits to the effective range of substrate\ that can he u t i lised [I I ] . Thc reduced cnantioselectivity can be due to either ;t too strong physisorption of the complex on the wall of the support, or a restricted environment that prevents the chiral TMCs to take the spacial configuration that i s required to induce c h ral recognition. For Jacobsen’s catalyst e. , a crucial factor is its ahility to assuiiic ;I folded structure [I 21.