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    Search term:"coupling_reactions"

    191 matches found for coupling_reactions

    Suzuki-Miyaura Cross-Coupling Reaction

    All of the preformed catalysts used in the kit are air and moisture stable complexes in their commercially available form. Once activated by base under the reaction conditions they become sensitive to air. To best enable scale-up success, the use of standard Schlenk technique is recommended. • Oven ...

    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...

    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 ...

    Asymmetric Palladium-Catalyzed Intramolecular a-Arylation of Aldehydes-

    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...

    Solvias® Ligand Portfolio for Enantioselective Hydrogenation

    Hans-Ulrich Blaser, Garrett Hoge, Matthias Lotz, Benoît Pugin, Anita Schnyder and Felix Spindler Solvias AG, P.O. Box, CH-4002 Basel, Switzerland Contact: Dr. Garrett Hoge, Product Manager Catalysis, garrett.hoge@solvias.com Today's Solvias Ligand Portfolio has its roots in the development of the Jo...

    TEMPO Catalyzed Oxidations

    TEMPO (2,2,6,6-Tetramethylpiperidinyloxy or 2,2,6,6-Tetramethylpiperidine 1-oxyl) and its derivatives are stable nitroxy radicals used as catalysts in organic oxidation reactions. TEMPO was discovered by Lebedev and Kazarnovskii in 1960. The stable free radical nature of TEMPO is due to the presence...

    NTz Building Blocks for Organic Semiconductors

    Fax: +81-48-462-1473, E-mail: takimiya@riken.jp The field of organic electronics has emerged as the next-generation technology potentially enabling ultra-thin, large-area, and/or flexible devices, consisting of organic field-effect transistors (OFETs), organic light-emitting diodes (OLEDs), and orga...

    Fluorous Literature Highlights for Small Molecule Synthesis

    Review Articles Fluorous Separation Media Fluorous Protecting Groups and Tags Fluorous Scavengers and Reagents Fluorous Catalysts and Ligands Fluorous Mixture Synthesis (FMS) Microwave-Assisted Fluorous Synthesis Fluorous Proteomics and Metabolomics Review Articles 1. Zhang, W.; Curran, D. P. Synthe...

    Lipshutz Kits

    Reactions once dependent on organic solvents are now being performed in water to eliminate the contributions of organic solvents to chemical waste – and the methodology just became easier with next-generation designer surfactant kits. The kit chemistry is safe, gentle, and employs the amphiphile TPG...

    Product Highlights for Organic and Inorganic Synthesis

    NEW! Trifunctional Probe Building Blocks NEW! Peptide Coupling Reagents Selection Guide NEW! Heterocycle and Cyclic Peptide Formation with N-(isocyamino)triphenylphosphorane (Pinc) By Application Area Peptide Synthesis • Peptide Coupling Reagents Selection Guide Cross-Coupling • SnAP Reagents (2015)...

    [JIM BALL TEST DOC] MIDA-protected Boronate Esters

    Josephine Nakhla 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 are...

    Organotrifluoroborates: Versatile and Stable Boronic Acid Surrogates

    Organotrifluoroborates: Versatile and Stable Boronic Acid Surrogates Prof. Gary Molander has extensively developed the chemistry of organotrifluoroborates. These bench stable boronic acid surrogates are useful for Suzuki-Miyaura cross-coupling reactions and have also been used for a variety of other...

    Palladium-Catalyzed Reaction of Aryl Iodides with ortho- Bromoanilines and Norbornene/Norbornadiene: Unexpected Formation of Dibenzoazepine Derivatives-

    The cross-coupling reaction of aryl bromides and iodides with aliphatic and aromatic thiols catalyzed by palladium complexes of the bisphosphine ligand CyPF-tBu (1) is reported. Reactions occur in excellent yields, broad scope, high tolerance of functional groups, and with turnover numbers that exce...

    Cyclopropane Reagent in Chemical Synthesis

    Potassium Cyclopropyltrifluoroborate: Cyclopropyl groups are found in a numerous natural products and are increasingly incorporated into pharmaceuticals such as the broad-spectrum antibiotic ciprofloxacin (Figure 1). A common method for installation of a pre-formed cyclopropane ring is through the u...

    Q-Phos - Technical Article

    • • Download PDF • Aldrich ChemFiles 2007, 7.10, 12. The use of electron-rich, sterically congested monodentate phosphine ligands, in conjunction with a metal complex, has become a common paradigm in transition metal catalyzed coupling reactions. Developed by Professor John Hartwig, pentaphenyl(di-t...

    Cross-Coupling Reaction Guide

    Accelerate Your Discovery with the Aldrich Cross-Coupling Guide We are excited to introduce our new Cross-Coupling Guide to support practicing chemists like you, to set up and troubleshoot some of the most commonly used cross-coupling reactions throughout academia and industry. The Cross-Coupling Qu...

    Cross-Couplings in Water

    Conducting transition metal-catalyzed cross-coupling chemistry in water instead of organic solvent has a number of potential benefi ts in terms of cost, environmental impact, safety, and impurity profiles. Increasing focus on the “green-ness” of chemical processes has further promoted recent develop...

    Pd(PhCN)2Cl2/P(t-Bu)3: A Versatile Catalyst for Sonogashira Reactions of Aryl Bromides at Room Temperature

    The Suzuki-Miyaura cross-coupling of unprotected, nitrogen-rich heterocycles using precatalysts P1 or P2 is reported. The procedure allows for the reaction of variously substituted indazole, benzimidazole, pyrazole, indole, oxindole, and azaindole halides under mild conditions in good to excellent y...

    KitAlysis High-Throughput Palladium Precatalyst Cross-Coupling Reaction Screening Kit

    Contents in each of the 2 individually sealed Mylar (foil bags): • 24 pre-weighed catalysts in glass vials loaded with stir bars, topped with cap mat. • 4 empty reaction vials with lids (to make stock solutions) The screening sets come pre-loaded with 1 µmol of catalyst in each vial according to the...

    Sonogashira Reaction in Water at Room Temperature using TPGS-750-M

    TPGS-750-M, DL-α-Tocopherol methoxypolyethylene glycol succinate, is a designer surfactant composed of a lipophilic α-tocopherol moiety and a hydrophilic PEG-750-M chain, joined by an inexpensive succinic acid linker. TPGS-750-M spontaneously forms micelles upon dissolution in water. The balance and...

    MeOBIPHEP - Technology Spotlights

    . Introduction . C–C coupling reactions . Materials List 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 resp...

    Organosilanols in Chemical Synthesis

    Powerful Nucleophiles for Cross-Coupling Over the past several years, the Pd-catalyzed cross-coupling of silicon compounds (Hiyama coupling) has rapidly gained acceptance as a suitable alternative to more commonly used methods such as Stille (Sn), Kumada (Mg), Suzuki (B), and Negishi cross-couplings...

    2nd Generation Buchwald Precatalysts

    Buchwald precatalysts and ligands are bulky electron-rich dialkylbiaryl phospine-based catalysts and structurally related ligands that improve reactivity in Pd-catalyzed cross - coupling reactions. These highly active reagents have been extensively applied in the synthesis of pharmaceuticals, natura...

    J.S. Johnson Group - Professor Product Portal

    Professor Product Portal Index Professor Jeffrey S. Johnson The Johnson group has developed a family of reagents that are useful for the modular preparation of highly substituted glycolic acid derivatives. Silyl glyoxylates are potent electrophiles by virtue of being α-dicarbonyls, and react with a ...

    Arylboronic Acids

    Aldrich is pleased to present its complete selection of arylboronic acids, the building blocks of the Suzuki coupling experiment. Most arylboronic acids readily undergo dehydration reactions to give a cyclic (trimer) anhydride. Our selection of arylboronic acids may contain varying amounts of this c...

    Tetrameric Phosphazene Bases

    Vol. 3, No. 1 Strong and Hindered Bases in Organic Synthesis Download a PDF version Introduction / Phosphazene Bases / Verkade's Superbases / Traditional bases Preservation of Reagents / Aldrich Schlenk-Type Glassware Phosphazene Bases Introduction / Monomeric Phosphazene Bases (P1) Dimeric Phosphaz...

    DNA Oligonucleotide Synthesis

    Phosphoramidite chemistry, developed in the 1980s and later enhanced with solid-phase supports and automation, is the method of choice for DNA oligonucleotide manufacturing. Opposite of biosynthesis, chemical synthesis proceeds in the 3' → 5' direction according to the steps outlined in Figure 1. No...

    Suzuki–Miyaura Coupling Reagents

    • • Download PDF • This brochure contains a comprehensive selection of boronic acids, boronic acid esters, diboron esters, and transition-metal catalysts useful for the Suzuki–Miyaura coupling reaction. New offerings are added monthly; if you don’t see the material you need for your research, please...

    Sonogashira Coupling Catalyzed by Palladium on Polymer Supports

    • • Download PDF • Supported palladium catalysts are widely used in the Suzuki, Heck, and Sonogashira cross-coupling reactions. The advantages to using supported catalysts in organic synthesis include reagent stability, suitability for automation, ease of workup, recyclability, and lower Pd contamin...

    Astec Chiral Chromatography Bibliography by Subject

    Amino Acids, Peptides, Biomolecules Chemical, Environmental, Petrochemical Chiral LC-MS Food, Beverage, Natural Products Mechanistic Studies Pharmaceutical, Clinical Preparative, SFC, SMB Daniel W. Armstrong Publications Copyright restrictions do not permit us to provide copies of the articles liste...