نتایج جستجو برای: aryl halide

تعداد نتایج: 21561  

Journal: :Angewandte Chemie 2023

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...

Journal: :Aggregate 2022

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...

2000
John F. Hartwig

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...

Journal: :Nature Synthesis 2022

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...

Journal: :The Journal of organic chemistry 2016
Saemi O Poelma G Leslie Burnett Emre H Discekici Kaila M Mattson Nicolas J Treat Yingdong Luo Zachary M Hudson Shelby L Shankel Paul G Clark John W Kramer Craig J Hawker Javier Read de Alaniz

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...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2004
Toyohide Takeuchi Junichi Sumida

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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