Results 251 to 260 of about 108,676 (277)

Sequential Column Asymmetric Catalysis

Chemistry - A European Journal, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Ahmed M, Hafez, Andrew E, Taggi, Thomas, Lectka   +2 more
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“Asymmetric” Catalysis by Lanthanide Complexes

Angewandte Chemie International Edition, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Koichi, Mikami, Masahiro, Terada, Hiroshi, Matsuzawa   +2 more
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Asymmetric catalysis with peptides

Chemical Communications, 2011
Over the past decade several peptides have been developed as effective asymmetric catalysts for a range of synthetically useful reactions. Many have properties that are difficult to achieve with other catalysts. The article highlights features that render peptidic organocatalysts unique and attractive for future applications.
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Nonlinear Effects in Asymmetric Catalysis

Angewandte Chemie International Edition, 2008
AbstractThere is a need for the preparation of enantiomerically pure compounds for various applications. An efficient approach to achieve this goal is asymmetric catalysis. The chiral catalyst is usually prepared from a chiral auxiliary, which itself is derived from a natural product or by resolution of a racemic precursor.
Tummanapalli, Satyanarayana, Susan, Abraham, Henri B, Kagan   +2 more
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Dendrimeric phosphines in asymmetric catalysis

Chem. Soc. Rev., 2008
Dendrimers are hyperbranched nanosized and precisely defined molecules, attracting increasing attention each year due to their numerous properties in catalysis, materials science, and biology. This tutorial review concerns the use of dendrimers as catalysts and focuses more precisely on their properties as enantioselective catalysts. Emphasis is put on
Anne-Marie, Caminade, Paul, Servin, Régis, Laurent, Jean-Pierre, Majoral   +3 more
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Aqueous Phase Asymmetric Catalysis

2011
Although stereoselective transformations in living systems occur in an aqueous environment, it was only recently that a breakthrough was achieved in the use of water as a solvent or co-solvent in asymmetric synthesis. While few years ago, only a few practitioners studied the subject, now organic reactions in water have become one of the most exciting ...
Buda, Szymon, Pasternak-Suder, Monika, Młynarski, Jacek   +2 more
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Additive Effects on Asymmetric Catalysis

Chemical Reviews, 2016
This review highlights a number of additives that can be used to make asymmetric reactions perfect. Without changing other reaction conditions, simply adding additives can lead to improved asymmetric catalysis, such as reduced reaction time, improved yield, or/and increased selectivity.
Liang, Hong, Wangsheng, Sun, Dongxu, Yang, Guofeng, Li, Rui, Wang   +4 more
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Metallopeptides for Asymmetric Dirhodium Catalysis

Journal of the American Chemical Society, 2010
Natural peptide sequences ligate to dirhodium centers through two bridging aspartate side chains, creating a macromolecular ligand framework with helical structure. The generation of a small peptide library allowed optimization of peptide sequence and produced an efficient catalyst for enantioselective carbenoid insertion into Si-H bonds.
Ramya, Sambasivan, Zachary T, Ball
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Asymmetric phase-transfer catalysis

Nature Reviews Chemistry
Over the past three decades, chiral phase-transfer catalysts (PTCs) have emerged as highly successful organocatalysts in a diverse range of asymmetric reactions. A substantial number of chiral PTCs have now already been discovered and utilized in dependable routes to enantioenriched products.
Hyo-Jun Lee, Keiji Maruoka
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Asymmetric Phase-Transfer Catalysis

Angewandte Chemie International Edition, 1999
Both in the laboratory and industrially, phase-transfer catalysis offers the potential to induce asymmetry into reactions with anionic intermediates. Equation (a) provides an example (conditions: a) 10 mol % phase-transfer catalyst, BnBr, CsOH⋅H2 O, PhMe, 15-24 h, -78°C).
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