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      A surface-confined OMnV(salen) oxene catalyst and high turnover values in asymmetric epoxidation of unfunctionalized olefins

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          Privileged chiral catalysts.

          One of the most active current areas of chemical research is centered on how to synthesize handed (chiral) compounds in a selective manner, rather than as mixtures of mirror-image forms (enantiomers) with different three-dimensional structures (stereochemistries). Nature points the way in this endeavor: different enantiomers of a given biomolecule can exhibit dramatically different biological activities, and enzymes have therefore evolved to catalyze reactions with exquisite selectivity for the formation of one enantiomeric form over the other. Drawing inspiration from these natural catalysts, chemists have developed a variety of synthetic small-molecule catalysts that can achieve levels of selectivity approaching, and in some cases matching, those observed in enzymatic reactions.
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            Role of anthocyanidin reductase, encoded by BANYULS in plant flavonoid biosynthesis.

            Condensed tannins (CTs) are flavonoid oligomers, many of which have beneficial effects on animal and human health. The flavanol (-)-epicatechin is a component of many CTs and contributes to flavor and astringency in tea and wine. We show that the BANYULS (BAN) genes from Arabidopsis thaliana and Medicago truncatula encode anthocyanidin reductase, which converts anthocyanidins to their corresponding 2,3-cis-flavan-3-ols. Ectopic expression of BAN in tobacco flower petals and Arabidopsis leaves results in loss of anthocyanins and accumulation of CTs.
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              Chemical CO2Fixation:  Cr(III) Salen Complexes as Highly Efficient Catalysts for the Coupling of CO2and Epoxides

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                Author and article information

                Journal
                JMACEP
                Journal of Materials Chemistry
                J. Mater. Chem.
                Royal Society of Chemistry (RSC)
                0959-9428
                1364-5501
                2012
                2012
                : 22
                : 38
                : 20561
                Article
                10.1039/c2jm34847k
                3666237d-f1d3-4d0d-9356-ba3fbd32bafb
                © 2012
                History

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