نتایج جستجو برای: aryl halide
تعداد نتایج: 21561 فیلتر نتایج به سال:
Abstract Benzoxaborinines are intermediates en‐route to bicyclic boronates that important active pharmaceutical ingredients (APIs). Herein, the haloboration of o ‐alkynyl‐phenols using BX 3 (X=Cl or Br) is disclosed as a route form C4‐X‐benzoxaborinines with good functional group tolerance. Computational studies indicated there two similar in barrier mechanisms: (i) double alkyne followed by re...
Photosensitizing supramolecular assemblies based on a phenazine derivative (PPA) have been developed, which show strong affinity toward Pd2+ ions to generate ensemble [email protected] nanoparticles (NPs). The NPs catalyse the Suzuki cross-coupled reaction under mild conditions (aerial conditions, mixed aqueous media, and visible light radiations). Although exhibit for arylboronic acid could ho...
Studies on the palladium-catalyzed formation of aryl amines, aryl ethers and a-aryl carbonyl compounds from aryl halides are reported. These studies range from synthetic methodology, to detailed mechanistic analysis, to new methods one can use to screen for catalytic covalent bond formation. Improved methods for formation of aryl ethers and room temperature amination chemistry have resulted fro...
Abstract Carbon–heteroatom (C–X) cross-coupling is a common method for bond-forming reactions in chemistry but the more electronegative heteroatom X is, challenging bond formation becomes. Although reductive elimination from Cu(III) intermediates to form C–X bonds generally facile reaction, oxidative addition of Cu(I) into carbon–(pseudo)halide aryl (pseudo)halides energetically challenging. Th...
Despite the number of methods available for dehalogenation and carbon-carbon bond formation using aryl halides, strategies that provide chemoselectivity for systems bearing multiple carbon-halogen bonds are still needed. Herein, we report the ability to tune the reduction potential of metal-free phenothiazine-based photoredox catalysts and demonstrate the application of these catalysts for chem...
Halide ions could be visualized via fluorescence quenching in microcolumn ion chromatography. The fluorescence of quinine sulfate, which was contained in an acidic eluent, was quenched by halide ions. The observed fluorescence quenching values increased in this order: iodide, bromide, and chloride. The present detection system was relatively sensitive to halide ions except for fluoride: other a...
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