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    Search term:"cross_couplings"

    189 matches found for cross_couplings

    Stephen Buchwald Group – Professor Product Portal

    Professor Product Portal Index Professor Stephen Buchwald The Buchwald group has developed a series of highly active and versatile palladium precatalysts and biarylphosphine ligands used in cross-coupling reactions for the formation of C-C, C–N, C–O, C–F, C–CF3, and C–S bonds. The ligands are electr...

    Cross-Coupling

    Cross-coupling has been an essential reaction for the past 20 years with its utilization increasing exponentially for the last 10 years. It has been used in the synthesis of a variety of products ranging from natural compounds to polymers. Products: • Chem Product Central™ • Catalysts and Ligands • ...

    Learning Center

    Aldrich Chemistry Webinars • Cheminar 3.1 - Building a Better Cross-Coupling Catalyst by Rational Design • Cheminar 1.2 - Potassium Organotrifluoroborates: High-Performance Boronic Acid/Ester Surrogates Technology Spotlights • Buchwald Ligands • CataCXium® • ChemDose® • Oranosilanols • Organotrifluo...

    Potassium Trifluoroborates Reagents for Suzuki Coupling

    Vol. 3, No. 3 Reagents for Suzuki Coupling Download PDF Introduction / Boronic acids / Boronic acid Esters / Diboron Esters Potassium Trifluoroborates / OSVB, Volume 3: Suzuki Coupling Potassium Trifluoroborates Alkyl, aryl, and alkenyl trifluoroborate salts are compelling alternatives to boronic ac...

    MIDA Boronates for Suzuki–Miyaura Cross-Couplings

    Aaron Thornton, Ph.D. Product Manager aaron.thornton@sial.com Professor Martin Burke and coworkers recently prepared retinal using key MIDA building block BB1 in iterative Suzuki-Miyaura cross coupling reactions (Scheme 1). The MIDA unit of BB1 is unreactive under these conditions, allowing for the ...

    Negishi cross-coupling of secondary alkylzinc halides with aryl/heteroaryl halides using Pd-PEPPSI-IPent

    Over the past two decades, considerable attention has been given to the development of new ligands for the palladium-catalyzed arylation of amines and related NH-containing substrates (i.e. Buchwald-Hartwig amination). The generation of structurally diverse ligands, by research groups in both academ...

    Translational Research Lead Optimization

    Chemical Synthesis and Sourcing Purification & Analysis Secondary Assays Workflows End-to-end solutions for the lead optimization and chemical synthesis workflows, supporting the needs of both chemists and non-chemists with industry-leading availability and innovation. Rapid Custom Synthesis: Made t...

    MIDA Boronates for Classically Challenging Suzuki-Miyaura Cross-Couplings

    The power of this slow-release concept has been further illustrated by utilizing various MIDA boronates of which the corresponding boronic acids have historically exhibited challenges with respect to either storage or use, including 2-heterocyclic, vinyl and cyclopropyl boronic acids. Because these ...

    Jeffrey Bode Group – Professor Product Portal

    Professor Product Portal Index Professor Jeffrey W. Bode The Bode Group aims to develop new reactions and reagents for the synthesis of complex molecules. The Bode Group has developed N-mesityl-substituted NHCs as organocatalysts for the catalytic generation of reactive species including activated c...

    Hydrosilylation Catalyst in Chemical Synthesis

    [Cp*Ru(MeCN)3]PF6: A Highly Efficient Hydrosilylation Catalysts Vinylsilanes are versatile organometallic reagents that participate in a variety of reaction paradigms such as Tamao–Fleming oxidation, olefin metathesis, Pd-catalyzed cross-coupling, protodesilylation, and cycloaddition. Of the availab...

    Non-Proprietary Phosphine Ligands - Technical Article

    • • Download PDF • In the pharmaceutical industry, Pd-catalyzed processes have frequently been relied on for carrying out key bond formations. While there are many ligands that efficiently mediate C–C and C–N bond formations, there is still a need for ligands that address the gaps in the current met...

    Chemicals Resource Center

    Welcome to our resource hub, where we aim to provide you with informational and educational materials to help you maximize your productivity and efficiency in your daily industrial chemical research and development activities. Brochure: eBusiness Solutions From customized purchasing platforms to che...

    Rational and Predictable Chemoselective Synthesis of Oligoamines via Buchwald-Hartwig Amination of (Hetero)Aryl Chlorides Employing Mor-DalPhos

    We report our studies on the use of two catalyst systems, based on the ligands BrettPhos and RuPhos, which provide the widest scope for Pd-catalyzed C-N cross-coupling reactions to date. Often low catalyst loadings and short reaction times can be used with functionalized aryl and heteroaryl coupling...

    KitAlysis™ C-N (Buchwald-Hartwig) High-Throughput Screening Kit

    Contents in each of the 4 individually sealed Mylar (foil bags): • 24 (12 x2) pre-weighed catalysts in glass vials loaded with stir bars, topped with cap mat. The screening sets come pre-loaded with 1 µmol of catalyst in each vial according to the following design. • Cesium Carbonate: ground and sie...

    Iodinated Building Blocks

    Aldrich ChemFiles 2010, 10.3, 15. Iodine-containing substrates are valuable building blocks for a diverse array of synthetic methodologies. They have the ability to participate in various cross-coupling reactions for the generation of carbon–carbon, carbon–nitrogen, and carbon– oxygen bonds. Often i...

    MIDA-protected Boronate Esters

    • • Download PDF • Product Manager The Suzuki-Miyaura cross-coupling reaction is one of the most important and highly utilized reactions in organic chemistry, with applications in polymer science as well as in the fine chemicals and pharmaceutical industries. However, some classes of boronic acids a...

    Chemical Synthesis

    Sigma-Aldrich Chemistry is the market leader in Chemical Synthesis – providing the most comprehensive product range, innovative products, and enabling technologies for chemical research. Our featured products include organic building blocks, functionalized heterocycles, versatile catalysts and ligan...

    Reference Books

    Vol. 2, No. 1 Products for Suzuki Coupling Download PDF (1.03 MB) Introduction / Boronic Acids / Boronic Acids Esters / Diboron Esters / Prolines & Pyroglutamates Transition-Metal Catalysts / Palladium Scavengers / Large-Scale Suzuki Coupling / Reference Books Reference Books Organic Syntheses via B...

    Stereospecific Cross-Coupling of Secondary Organotrifluoroborates: Potassium 1-(Benzyloxy)alkyltrifluoroborates

    The synthesis of potassium trifluoro(N-methylheteroaryl)borates and their use in cross-coupling reactions with various aryl and heteroaryl halides to construct N-methyl heteroaryl-substituted aromatic and heteroaromatic compounds are reported. A 10 mL microwave vial equipped with a stirrer bar was c...

    Nickel Precatalysts

    Suzuki-Miyuara couplings have been widely commonplace in the formation of C-C bonds, in particular the coupling between two heteroaryl compounds. For the most part, palladium has been the dominant choice of metal catalyst to carrying out cross-coupling reactions between heteroaryl boronic acids and ...

    Development of Organic Semiconductors from Highly Ordered Oligo and Polythiophenes

    Nicholas S. Colella, Lei Zhang, Alejandro L. Briseño* Polymer Science & Engineering Department, University of Massachusetts, Amherst, Massachusetts 01003 *Email: abriseno@mail.pse.umass.edu The soaring global demand for energy, coupled with the limited supply of fossil fuels, has increased the need ...

    PTS—New Amphiphile for Metathesis and Cross-Coupling in Water

    Recently introduced by Professor Bruce Lipshutz of UC, Santa Barbara, polyoxyethanyl α-tocopheryl sebacate (PTS) is a nonionic amphiphile that is proving to be a versatile “solubilizer” for organic molecules in water.1 (698717) Lipophilic substrates and catalysts can efficiently enter micelles forme...

    First cross-coupling reactions on halogenated 1H-1,2,4-triazole nucleosides

    C-O activation of mesylates by a palladium catalyst and subsequent cross-coupling with potassium cyclopropyltrifluoroborate have been achieved with high yield. Both electron-enriched and electron- deficient aryl mesylates are suitable electrophilic partners for the Suzuki-Miyaura reaction. The scope...

    Diversinates™: Any-Stage Functionalization of (Hetero)aromatic Scaffolds

    The synthesis of heteroaromatic and aromatic compounds is at the heart of the chemical industry. With the ever-growing demand of new chemical entities coupled to the dwindling resources and time constraints allotted to any given research project, a rapid way to diversify (hetero)aromatic scaffolds i...

    AlPhos and [(AlPhosPd)2•COD] for Pd-Catalyzed Fluorination

    Fluorine containing aromatics (ArF) are desirable compounds with applications in medicinal chemistry and the agricultural industry. While Pd-catalyzed cross coupling has enabled the mild and general synthesis of aryl–C, –N, and –O bonds, the development of an analogous aryl–F bond forming process ha...

    ChemDose Applications and Advantages

    . Convenient Dosing of Catalysts and Reagents . Advantages . Representative Application . Frequently Asked Questions (FAQs) . Technical Information for Download (PDF format) . Materials List ChemDose® is a novel technology allowing for the use of chemical reagents and catalysts in the form of tablet...

    Selective Monoarylation of Acetate Esters and Aryl Methyl Ketones Using Aryl Chlorides

    A series of palladacyclic precatalysts that incorporate electron-rich di-tert-butylphosphino biaryl ligands is reported. These precatalysts are easily prepared, and their use provides a general means of employing bulky ligands in palladium-catalyzed cross-coupling reactions. The application of these...

    A new palladium catalyst system for the cyanation of aryl chlorides with K4[Fe(CN)6]

    Potassium 1-(alkoxy/acyloxy)alkyltrifluoroborates have been synthesized through a copper-catalyzed?diboration of aldehydes and subsequent conversion of the?resulting potassium 1-(hydroxy)alkyltrifluoroborates. The?palladium-catalyzed Suzuki?Miyaura reaction employing the?potassium 1-(benzyloxy)alkyl...

    Catalysis Guide

    • Highly Selective Palladium-Catalyzed Cross-Coupling of Secondary Alkylzinc Reagents with Heteroaryl Halides • Palladium-Catalyzed Amination of Unprotected Five-Membered Heterocyclic Bromides • Stereospecific Pd-Catalyzed Cross-Coupling Reactions of Secondary Alkylboron Nucleophiles and Aryl Chlori...

    MIDA Boronate Building Blocks Webinar

    Host Martin D. Burke, Ph.D. Assistant Professor of Chemistry Unversity of Illinois at Urbana-Champaign, U.S.A. Towards a General Platform for Small-Molecule Synthesis This Aldrich Chemistry Webinar discusses the many physical and chemical properties of MIDA boronates that underlie their widespread u...