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    Search term:"catalysis"

    756 matches found for catalysis

    Phase I Drug Metabolism

    • • Download PDF • Phase I biotransformation reactions introduce or expose functional groups on the drug with the goal of increasing the polarity of the compound. Although Phase I drug metabolism occurs in most tissues, the primary and first pass site of metabolism occurs during hepatic circulation....

    Chiral Silacycles for Enantioselective Allylation and Crotylation Reactions

    The asymmetric allylation and crotylation of aldehydes and other carbonyl compounds remains one of the most fundamental reactions for the construction of chiral building blocks. While numerous methods for this challenging task have been examined previously, including the use of chiral auxiliaries, c...

    Landis Ligands in Chemical Synthesis

    Diazaphospholane Ligands for Catalytic Asymmetric Transformations Introduction The interest in asymmetric reactions has been growing for the past 40 years. To address the challenges of synthesizing chiral building blocks with high yields and high selectivities, researchers developed a broad range of...

    Cytochrome c - A Model Protein for Molecular Evolution

    Cytochrome c is a highly conserved ~12 kDa protein consisting of a single 104 amino acid peptide with a single heme group, which is covalently attached to Cys14 and Cys17. Because of its ubiquitous nature and sequence homology, cytochrome c has been used as a model protein for molecular evolution.1 ...

    ChiralQuest Phosphine Ligands and Complexes

    Aldrich ChemFiles 2008, 8.2, 47. Professor Xumu Zhang at Penn State has made remarkable advances by creating a toolbox of chiral phosphines which can be used on a variety of substrates, some of which have been historically resistant to facile hydrogenation. Furthermore, an additional benefit in some...

    (S)-(–)-5-(2-Pyrrolidinyl)-1H-tetrazole – L-Proline’s Isosteric Companion in Organocatalysis

    Organocatalysis provides convenient new methods to construct complex chiral compounds with operational simplicity and without the need for metals. (S)-(–)-5-(2-Pyrrolidinyl)-1H-tetrazole 684341 (Figure 1) is an isoster of L-proline with similar pKa, but anticipated greater solubility and reactivity ...

    IRMOF-8 | Metal-Organic Frameworks (MOF's)

    Explore MOF Applications, Properties and Materials to construct MOFs in the MOF Constructor Tool Literature suggests that the following materials can be used to prepare IRMOF-8. • Linker: H2NDC (2,6-Naphthalenedicarboxylic acid) • Metal Source: Zinc Salts (Zn) & Zinc SBU • Crytallographic and supple...

    ChiralQuest Phosphine Ligands - Aldrich ChemFiles 2006, 6.8, 10.

    Aldrich ChemFiles 2006, 6.8, 10. One of the most efficient methods for constructing chiral compounds is asymmetric hydrogenation. Catalytic asymmetric hydrogenations are among the most widely used industrial catalytic processes, due to their high turnover rates, atom economy, and inexpensive materia...

    ChemFiles Colume 9 Article 6 - Cross Metathesis

    Cross metathesis has become an invaluable method for the preparation of olefins.1 While cross metathesis is typically conducted under mild conditions and is tolerant of a variety of functionalities, the chemo- and stereoselectivity of the reaction were more difficult to predict.2 However, due to adv...

    glyoxalase I
    Synonyms GLOD1, GLYI
    Species Human (2739) , Species Mouse (109801) , Species Rat (294320) , Species Zebrafish (368213) , Species domestic cat (101085123) , Species cow (540335) , Species dog (474894) , Species chicken (421428) , Species sheep (101102520) , Species domestic guinea pig (100726491) , Species naked mole-rat (101699804)
    Summary: The enzyme encoded by this gene is responsible for the catalysis and formation of S-lactoyl-glutathione from methylglyoxal condensation and reduced glutatione. Glyoxalase I is linked to HLA and is localized to 6p21.3-p21.1, between HLA and the centromere. [provided by RefSeq, Jul 2008]

    Enantiomeric Purities of Pharmaceuticals Using Carbohydrate-based Isothiocyanates

    In the first two papers of this series (Analytix Nr. 1/2010 and 2/2010), the efficient enantiomeric analysis of (a) alkyl oxiranes, and (b) amino acids was described using inexpensive reversed phase columns (as an alternative to high cost so-called “chiral columns”) in combination with monosaccharid...

    Continuous Flow Synthesis in Microstructured Reactors — A New Way of Thinking Chemical Synthesis

    • • Download PDF • Organic chemists usually spend a substantial amount of time on the development of synthetic routes to new materials. The best pathways need to be chosen and reaction conditions must be optimized. Once a product is successful and demand for larger quantities is growing, the whole s...

    Enzyme Class Index: Hydrolases other

    Sigma offers over 1,600 enzymes as well as associated inhibitors and substrates. TO SEARCH FOR AN ENZYME BY EC # OR REACTION CATALYZED... 1. Click on a category in the menu below 2. Scroll down the list to the enzyme of interest 3. Click on the Product # to access product listing and related informa...

    Proline Analogs

    Coined by Jacobsen1 as the “simplest enzyme,” L-proline is capable of effecting a variety of catalytic asymmetric transformations. The first examples were reported in the mid-70s, when L-proline was applied to Robinson annulation reactions.2 However, the big potential of proline as an organocatalyst...

    Graphite Nanofibers: Demineralization Procedure

    Graphite nanofibers (GNF) have been utilized in a number of catalysis and alternative energy applications. For example, they have found use in Lithium-ion batteries where they have been found to be ideal for lithium intercalation,1 as well as in fuel cells where, combined with platinum nanoparticles...

    Asymmetric Epoxidation Using Shi Catalyst | Technical Article

    Aldrich ChemFiles 2008, 8.6, 13. Catalytic asymmetric epoxidation of alkenes has been the focus of many research efforts over the past two decades, the best known methods probably being those developed by Sharpless1 and Jacobsen- Katsuki.2 Shi has also developed a very efficient method for asymmetri...

    Solvias Ferrocenyl-Based Ligands

    Aldrich ChemFiles 2006, 6.8, 12. Solvias AG has demonstrated the incredible utility of chiral ferrocenyl diphosphine ligands in a wide range of reaction paradigms ranging from hydrogenation1 to the aldol reaction2 to hydroboration.3 For years, BINAP was considered the only ligand platform that could...

    ChiralQuest Phosphine Ligands - ChemFiles Volume 5 Article 10

    The field of asymmetric catalysis has been primarily represented by methodologies that have focused on incorporating hydrogen in a stereoselective manner into achiral molecules, especially in industrial applications. It is well known that hydrogen is the most common constituent in the immense realm ...

    Solvias MeOBIPHEP Ligands - State-of-the-art atropisomeric MeO-BIPHEP ligands

    Introduction State-of-the-art atropisomeric MeOBIPHEP ligands, also referred to as MeO-BIPHEP, originally developed by Roche, have an extraordinarily broad performance profile for many synthetic applications due to their modular ligand design. In many respects, the catalytic profile of the MeOBIPHEP...

    Catalysis for Innovative Solutions

    Contact SAFC • Contract Manufacturing Inquiries • • Download PDF • SAFC® and CatScI's dynamic partnership enables clients to benefit from a single source for high-quality, high-value fundamental research, development, scale-up and manufacturing. By offering additional process development resources t...

    Enzyme Explorer - Enzymes for Multi-Drug Resistance Research (Xenobiotics)

    Enzymes for Multi-Drug Resistance Research Review Article: • Multi-Drug Resistance in Cancer - Role of ABC Transporter Proteins • Cytochrome P450s (CYPs) • Cytochrome-P450 Reductase • Cytochrome b5 • Sulfotransferase (SULTs) • Glutathione Transferases • UDP-glycosyltransferase (UGT/GLUCs) • Cytochro...

    Polyelectrolyte Multilayer Films and Membrane Functionalization

    • • Download PDF • Merlin L. Bruening Maneesha Adusumilli Department of Chemistry, Michigan State University East Lansing, MI 48824 Email: bruening@chemistry.msu.edu Among the many methods for preparing thin films, layer-by-layer (LbL) deposition of complementary polymers has emerged as an especiall...

    Synthesis of Polyene Natural Products Using Polyene MIDA Boronates

    Palladium-catalyzed cross-coupling reactions are ideal methods for the synthesis of polyenes because of the stereospecificity of the reactions and the mildness of the reaction conditions. However, polyenylboronic acids are very unstable and therefore difficult to employ in the synthesis of polyenes ...

    Chiral 2,2’-Bipyrrolidines

    Daniel Weibel, Ph.D. European Market Segment Manager, Chemistry daniel.weibel@sial.com C2-symmetrical, chiral 2,2’-bipyrrolidines have recently emerged as interesting structural chiral motifs in a number of ligands for asymmetric transformations (Figure 1). When the two nitrogen atoms function eithe...

    Injectable Hydrogels for Cell Delivery and Tissue Regeneration

    Prathamesh M. Kharkar,1 April M. Kloxin1,2* 1Materials Science and Engineering and 2Chemical and Biomolecular Engineering University of Delaware, Newark, DE 19716 USA *Email: akloxin@udel.edu The use of hydrogel-based biomaterials for the delivery and recruitment of cells to promote tissue regenerat...

    Translational Research Solutions Pre-Clinical Development

    Process Chemistry Scalable Separations ADME/Tox Pre-Formulation & Drug Delivery Enabling the transition from bench to plant with cutting-edge chemical technology and reliable sourcing services. New technologies that enable greener, safer processes are also emphasized. • Route & Process Optimization ...

    Ca/CaMKs

    Free calcium is a major second messenger in all cell types. One mechanism by which calcium ions exert their effects is by binding to a 17 kDa protein, calmodulin (CaM). The binding of four calcium ions to calmodulin changes its conformation and promotes its interaction with a number of other protein...

    Aldrich Materials Science Presents a Technical Webinar - Graphene and new monoatomic materials: Using 2-dimensional nanosheets in a 3-dimensional world

    Webinar Title: Graphene and new monoatomic materials: Using 2-dimensional nanosheets in a 3-dimensional world At the beginning of its exciting life, graphene was mostly a game for physicists. Then, chemists have learned how to “play” with this unique material by enhancing its processability and vers...

    Schaus MBH Catalyst

    Aldrich ChemFiles 2006, 6.4, 13. A highly enantioselective addition of cyclohexenone to different aldehydes (asymmetric Morita–Baylis–Hillman reaction) catalyzed by octahydro-BINOL-derived Brønsted acid (669172) was reported by Schaus (Scheme 15). Important for achieving high enantioselectivity were...

    Quinoline Ligands for Pd catalyzed C-H activation

    Pd catalyzed C-H activation is a powerful method for installing functional groups onto biologically relevant molecules. However, C(sp3)-H activation has proven quite challenging. Ligand selection is critical for these types of transformations because the ligands tune the metal catalyst’s reactivity ...

    Yb(BTC)(H2O) | Metal-Organic Frameworks (MOF's)

    Explore MOF Applications, Properties and Materials to construct MOFs in the MOF Constructor Tool Literature suggests that the following materials can be used to prepare Yb(BTC)(H2O). • Linker: TMA, H3BTC, BTC (Trimesic acid) • Metal Source: Ytterbium Salts (Yb) • Crystallographic and supplementary i...