Palladium-catalyzed direct ortho C X bond construction via C H activation of azobenzenes: Synthesis of (E)-1,2-b(2,6-dibromo(chloro)-phenyl)diazene
摘要:
A palladium-catalyzed direct C-X bond formation of azobenzenes with 1,3-dibromo-5,5-dimethylhydantoin or trichloro isocyanuric acid via C-H activation has been developed. The reaction could proceed smoothly under an air atmosphere at 110 degrees C in the presence of Pd(Ph3P)(4) in DCE and 13 examples of products were obtained. (C) 2019 Elsevier Ltd. All rights reserved.
The reduction of nitroarenes to anilines as well as azobenzenes to hydrazobenzenes using a single base-metal catalyst is reported. The hydrogenation reactions are performed with an air-and moisture-stable manganese catalyst and proceed under relatively mild reaction conditions. The transformation tolerates a broad range of functional groups, affording aniline derivatives and hydrazobenzenes in high
A highly efficient and practical procedure to direct ortho-sulfonylation of azobenzenes' C–H bond with arylsulfonylchlorides has been developed. The method was applicable to both electron-rich and electron-deficient substrates and delivered good yields for 21 examples. This reaction provides a convenient access to ortho-sulfonylated azobenzenes under mild conditions.
Cobalt(III)-Catalyzed Synthesis of Indazoles and Furans by C–H Bond Functionalization/Addition/Cyclization Cascades
作者:Joshua R. Hummel、Jonathan A. Ellman
DOI:10.1021/ja5116452
日期:2015.1.14
reported heterocycle syntheses also demonstrate the use of directing groups that have not previously been applied to Co(III)-catalyzedC–H bond functionalizations. Additionally, the synthesis of furans demonstrates the first example of Co(III)-catalyzedfunctionalization of alkenyl C–H bonds.
A photochromic latex ink includes an organic polymer; optionally a colorant, and a photochromic compound. The photochromic ink composition has an average particle size from about 20 nm to about 600 nm. The photochromic ink composition is capable of reversibly converting from a first color to a second color in response to a predetermined wavelength scope.