Chiral Catalyst Immobilization and Recycling (Wiley-Vch) by Dirk De Vos, Ivo F. J. Vankelecom, Pierre A. Jacobs

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 leads to the lack of the catalytic fabric. Immobilization bargains a possible resolution for the consumer of enantioselective catalysts in commercial tactics and laboratories. Heterogeneous catalysis permits non-stop operations, recycling of the catalyst, and a straightforward separation of the response items, lowering either waste and prices. Chemists in academia and will welcome this cautious collection of subject matters during this instruction manual that offers readers with useful and exact information regarding the technical necessities for the immobilization of chiral catalysts, their program in synthesis, and strategies for recycling.

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M o / . Cutul. 63 (1990) 319. R. Augustine, S. Tanielyan, S. Anderson, H. Yang, Chern. Commun. (1999) 1257. T. E. Davis, J. Curd. 148 (1994) I . T. E. Davis, J. Cutul. 152 (1995) 25. E. De Vos, F. P. F. A. Jacobs, Mucromol. Symp. 80 (1994) 157. B. Ogunwumi, T. Bein, Chem. Commun. (1997) 901. J. Sabater, A. C o m a , A. Domenech, V. Fomts, H. Garcia, Chem. Commun. (1997) 1285. J. Blum, D. Avnir, H. Schuhmann, Chemrech (1999) 32. J. Vankelecom, D. F. Parton, V. A. Jacobs, Angew. Chem. Int. Ed. Engl.

45 Ref a +=Heterogeneous reaction gives better results than the homogeneous one, even if this concerns sometimes only one subsrrate under specific conditions. OK=results are comparable to first run; +=better than in first run; -=worse than in first run. Type of heterogenization, following the classification in the text: cov =covalent attachment; ads = adsorption or ion pair formation; caps = encapsulation: trap =entrapment; SLP= supported liquid phase; aux =modification of an achiral heterogeneous catalyst with a chiral selector.

Based on the observed color change, this was tentatively explained for the hydrogenation with Rh(D1PAMP)(P/W)heteropolyacid-montmorilloniteby some partial reduction of the tungsten in the heteropolyacid. Lanthana was the only support that did not show this improvement, which was ascribed to its basic nature. 3 Encapsulation Encapsulating a TMC in the cages of a zeolite, for example, fully depends on the respective sizes of the complex and the cage in which it is held sterically to prevent leaching during reaction.

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