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enantioselective catalysis in the presence of binary modifier mixtures is extended to account not only for the nonlinear dependence of the enantiomeric excess on the composition of the modifier mixtures, but also for maxima in ee . Comparison with experimental

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Journal of Flow Chemistry
Authors: Rajesh Munirathinam, Andrea Leoncini, Jurriaan Huskens, Herbert Wormeester, and Willem Verboom

Cinchona alkaloid and proline derivatives as enantioselective catalysts were covalently attached onto the inner walls of a microreactor using glycidyl methacrylate polymer brushes. The successful formation of the organocatalyst-functionalized brush layers on flat silicon oxide surfaces was confirmed by several techniques such as Fourier transform infrared (FT-IR), ellipsometry, and X-ray photoelectron spectroscopy (XPS). The applicability of the cinchona alkaloid (cinchonidine or quinidine)- and proline-containing polymer brushes in a microreactor was demonstrated for the Diels–Alder reaction between anthrone and N-substituted maleimides, and the aldol reaction between 4-nitrobenzaldehyde and cyclohexanone, respectively, which showed moderate conversions (up to 55% and 23%, respectively) and moderate to good enantioselectivities (up to 55% and 93%, respectively). The pristine catalytic activity of the microreactor was intact even after 1 month.

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-enyl)oxyquinolones: influence of the alkene substitution pattern, photophysical studies, and enantioselective catalysis by a chiral sensitizer” M. M. Maturi , M. Wenninger , R. Alonso , A. Bauer , A. Pöthig , E. Riedle ,* T. , Bach * Chemistry

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Introduction Ferrocene-based derivatives have been widely used in a lot of fields, such as electrochemistry [ 1 – 3 ], material science [ 4 – 6 ], and particularly enantioselective catalysis [ 7 – 9 ], because of their

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comprises multiple enantioresolution on a single chiral active center, when a number of enantiomers are formed with the help of only a small amount of chiral catalyst [ 1 – 5 ]. Enantioselective catalysis using homogeneous chiral metallic

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Organomet Chem . 122 : 83 – 97 10.1016/S0022-328X(00)92750-5 . 8. Brunner , H , Brandl , P . 1991 . Enantioselective catalysis 74.1 ligand excess and intermediates in the rhodium

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