A New Palladium Precatalyst Allows for the Fast Suzuki-Miyaura Coupling Reactions of Unstable Polyfluorophenyl and 2-Heteroaryl Boronic Acids
A method for the Pd-catalyzed coupling of 2-aminothiazole derivatives with aryl bromides and triflates is described. Significantly, for this class of nucleophiles, the coupling exhibits a broad subst...
Keywords: Catalysis, Chromatography
Catalytic Direct Cross-Coupling of Organolithium Compounds with Aryl Chlorides
Complex, hindered biaryls have been prepared at temperatures ranging from 1�C to room temperature, or with gentle heating. The Pd-PEPPSI-IPent catalyst nicely couples starting materials containing ac...
Keywords: Chromatography, Flash chromatography
Cross Coupling Reactions of Chiral Secondary Organoboronic Esters With Retention of Configuration-
We describe a systematic study of the scope and relationship between ligand structure and activity for a highly efficient and selective class of catalysts containing sterically hindered chelating alk...
Keywords: Aminations, Gas chromatography, Ligands
Design and preparation of new palladium precatalysts for C-C and C-N cross-coupling reactions
Good to excellent yields�of aryl trifluoromethyl sulfides, which are an important class of compounds in both the pharmaceutical and agrochemical areas, can be achieved under mild conditions by the Pd...
Keywords: Agrochemicals, Catalysis, Pharmaceutical
Electrolyte Reagents for Lithium-Ion Batteries
Introduction Battery grade electrolytes Solvents and additives Preparation of customized battery grade electrolyte solutions Materials References
Dr. Koji Abe
Advanced Energy Materials R&D Center, Chemicals Company, UBE Industries, Ltd.
Keywords: Acid value, Industries, Solvents
Highly Selective Palladium-Catalyzed Cross-Coupling of Secondary Alkylzinc Reagents with Heteroaryl Halides | Materials & Procedure
The highly selective palladium-catalyzed Negishi coupling of secondary alkylzinc reagents with heteroaryl halides is described. The development of atseries of biarylphosphine ligands has led to the i...
Keywords: Catalysis, Eliminations, Gas chromatography, Ligands, Negishi Coupling, Nuclear magnetic resonance spectroscopy, Oxidative additions, Reductive eliminations
Mild Palladium-Catalyzed Cyanation of (Hetero)aryl Halides and Triflates in Aqueous Media-
The development of a novel Pd-catalyzed synthesis of (hetero)aromatic nitriles from the corresponding aryl chlorides and potassium hexacyanoferrate(II) is described. This novel protocol avoids the us...
Keywords: Catalysis, Chromatography, Column chromatography, Gas chromatography, Ligands, Solvents
Mild and General Conditions for Negishi Cross-Coupling Enabled by the Use of Palladacycle Precatalysts
A wide range of biaryls were synthesized by palladium-catalyzed Negishi cross-couplings at ambient temperature or with low catalyst loading. This protocol features the use of a recently reported amin...
Keywords: Catalysis, Cross couplings
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-...
Keywords: Aminations, Arylations, Buchwald-Hartwig amination, Catalysis, Chromatography, Column chromatography, Cross couplings, Gas chromatography, Hydroaminations, Ligands, Thin layer chromatography
Palladium-catalyzed inter- and intramolecular cross-coupling reactions of B-alkyl-9-borabicyclo[3.3.1]nonane derivatives with 1-halo-1-alkenes or haloarenes. Syntheses of functionalized alkenes, arenes, and cycloalkenes via a hydroboration-coupling sequence
The cross-coupling reaction of B-alkyl-9-borabicyclo[3.3.l]nonanes (B-R-9 BBN), readily obtainable from alkenes by hydroboration, with 1-halo-1-alkenes or haloarenes in the presence of a catalytic am...
Keywords: Catalysis, Chromatography, Column chromatography, Coupling reactions, Cross couplings, Oxidations
Palladium/Tris(tert-butyl)phosphine-Catalyzed Suzuki Cross- Couplings in the Presence of Water
The Suzuki reaction is an exceptionally useful cross-coupling process that has been widely applied in synthetic chemistry, and boronic acids are, by far, the most commonly employed coupling partner. ...
Keywords: Chromatography, Column chromatography, Cross couplings, Eliminations, Oxidative additions, Suzuki reactions
Pd-PEPPSI-IPent: Low-Temperature Negishi Cross-Coupling for the Preparation of Highly Functionalized, Tetra-ortho-Substituted Biaryls-
A convenient protocol for the rapid and efficient synthesis of 3-(N-substituted) aminocoumarins is described. The synthetic route developed involves the Pd-catalyzed C-N coupling reaction from readil...
Keywords: Catalysis, Chromatography, Column chromatography, Coupling reactions, Purification
Regioselective Cross-Coupling of Allylboronic Acid Pinacol Ester Derivatives with Aryl Halides via Pd-PEPPSI-IPent-
Palladium-catalyzed direct cross-coupling of aryl chlorides with a wide range of (hetero)aryl lithium compounds is reported. The use of Pd-PEPPSI-IPent or Pd2(dba)3/XPhos as the catalyst allows for t...
Keywords: Catalysis, Chromatography, Column chromatography, Cross couplings, Evaporation
Reversed-Polarity Synthesis of Diaryl Ketones through Palladium- Catalyzed Direct Arylation of 2-Aryl-1,3-dithianes
The title reaction leads to satisfactory yields of dihydrodibenzoazepines�1?a�from norbornene. The dibenzoazepines�2�can also be accessed from compounds of type�1?b�when norbornadiene is used as a re...
Keywords: Chromatography, Column chromatography
Room-Temperature Alkyl-Alkyl Suzuki Cross-Coupling of Alkyl Bromides that Possess -- Hydrogens
The trifluoromethyl group can dramatically influence the properties of organic molecules, thereby increasing their applicability as pharmaceuticals, agrochemicals, or building blocks for organic mate...
Keywords: Agrochemicals, Building blocks, Catalysis, Pharmaceutical, transformation
The First Negishi Cross-Coupling Reaction of Two Alkyl Centers Utilizing a Pd-N-Heterocyclic Carbene (NHC) Catalyst
The development of an NHC-based system capable of cross-coupling sp3-sp3 centers in high yield has been a long-standing challenge. This communication describes the use of a Pd-NHC catalytic system th...
Keywords: Catalysis, Chromatography, Cross couplings, Flash chromatography
Properties of Solvents Table
a. Gant, R., LC/GC 10(7), 515 (1992) 1. At 20 °C 2. At 20 °C +/- 5 °C relative to water at 4 °C 3. At 10mmHg pressure 4. At l=589.32nm
Keywords: Gas chromatography, High performance liquid chromatography