Photoredox/Cobalt Dual Catalysis for Visible-Light-Mediated Alkene–Alkyne Coupling
作者:Pramod Rai、Kakoli Maji、Biplab Maji
DOI:10.1021/acs.orglett.9b01201
日期:2019.5.17
Dual photoredox transition-metal catalysis has recently emerged as a powerful tool for making synthetically challenging carbon–carbon bonds under milder reaction conditions. Herein, we report on the visible-light-mediated controlled generation of low-valent cobalt catalyst without the need for a metallic reductant. It enabled C–C bondformation via ene-yne coupling at roomtemperature. The generality
Palladium-Catalyzed Decarboxylative Coupling of Alkynyl Carboxylic Acids and Aryl Halides
作者:Jeongju Moon、Mihee Jang、Sunwoo Lee
DOI:10.1021/jo802290r
日期:2009.2.6
2-Octynoic acid and phenylpropiolic acid were employed for the palladium-catalyzed decarboxylative coupling reaction and with a variety of arylhalides. The former needed 1,4-bis(diphenylphosphino)butane (dppb) as a ligand and the latter tri-tert-butylphosphine (PtBu3), and both required 2 equiv of tetra-n-butylammonium fluoride (TBAF) for full conversion. These reactions showed high reactivities and
A series of N‐heterocyclic copper carbene complexes bearing sulfoxide and sulfone moieties have been prepared. In case of new copper compounds with sulfone ligand, the solid‐state structures were determined using X‐Ray crystallography. Obtained complexes were investigated as catalysts in such transformations as: 1,3‐dipolar cycloaddition of alkynes and azides (CuAAC), A3 coupling reaction and β‐hydroboration
Metal-complex dye, photoelectric conversion element, dye-sensitized solar cell, and dye solution containing metal-complex dye
申请人:FUJIFILM Corporation
公开号:US09953768B2
公开(公告)日:2018-04-24
A photoelectric conversion element, a photoelectric conversion element, a dye-sensitized solar cell and a dye solution, having an electrically conductive support, a photoconductor layer containing an electrolyte, a charge transfer layer containing an electrolyte, and a counter electrode, wherein the photoconductor layer contains semiconductor fine particles carrying a metal complex dye; and wherein the metal complex dye has at least a carboxyl group and a salt of the carboxyl group, the salt being selected from the group consisting of a potassium salt, a lithium salt, and a cesium salt, and the ratio α of the number of the salt of the carboxyl group divided by the total number of the carboxyl group and the salt of the carboxyl group to be found in one molecule of the metal complex dye, lying in the range of 0.1 to 0.9.
Z-Stereoselective semi-reduction of alkynes: modification of the Boland protocol
作者:Yasser M.A. Mohamed、Trond Vidar Hansen
DOI:10.1016/j.tet.2013.03.038
日期:2013.5
Highly Z-selective semi-reduction of alkynes has been achieved by adding TMSCl to a mixture of Zn(Cu/Ag), water, and methanol. The conjugated Z-alkenes have been prepared in high yields at ambient temperature. The formation of isomeric E-alkenes and over-reduction to alkanes were suppressed in our modified Boland reduction protocol. The methodology was extended to the preparation of Z-substituted stilbenes