Silver-Catalyzed Synthesis of 1-Chloroalkynes Directly from Terminal Alkynes
摘要:
AbstractAn efficient method to prepare 1‐chloroalkynes was investigated. The method involved the use of readily available terminal alkynes and a catalytic amount of a silver salt with N‐chlorosuccinimide as the chlorinating agent under mild conditions. Compared with the existing process, this method has a broad substrate scope: 19 examples were explored, and the products were obtained in excellent yields and were easily isolated by vacuum distillation. Moreover, recycling of the catalyst was achieved by simple filtration and desiccation, which made the method more economic and environmentally benign.
Au-Catalyzed intermolecular (3 + 2 + 1) and (5 + 2) cycloaddition for the synthesis of 1,4-dioxenes and 4,7-dihydrooxepines
作者:Congrong Liu、Jin Xu、Gongde Wu
DOI:10.1039/d0cc05059h
日期:——
present interesting potential as motifs for the incorporation of biologically relevant molecules, agrochemicals and materials. In this study, two efficient intermolecular (3 + 2 + 1) and (5 + 2) cycloadditions for the synthesis of 1,4-dioxenes and 4,7-dihydrooxepines are achieved with gold catalysis.
Gold-Catalyzed Regio- and Stereoselective α-Acyloxy-β-Alkynylation of Ynol Ethers
作者:Yaowen Liu、Chunyu Han、Hongwei Shi、Alexandra V. Mackenroth、Linghua Zhang、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1021/acs.joc.2c02597
日期:2023.3.3
sciences. Herein, the synthesis of tetra-substituted enol ester 2-iodobenzoate derivatives was achieved in good yields at room temperature through a gold-catalyzed acyloxyalkynylation of sensitive ynol ethers with ethynylbenziodoxolones (EBXs), the latter acting as bifunctional reactants. The conversion is highly regioselective with a broad substrate scope. Mechanistically, an Au(III) species is the key
AROMATIC HYDROCARBON-BASE PROTON EXCHANGE MEMBRANE AND DIRECT METHANOL FUEL CELL USING SAME
申请人:Toyo Boseki Kabushiki Kaisha
公开号:EP1826846A1
公开(公告)日:2007-08-29
A proton exchange membrane is obtained which can give an excellent power generation characteristic when the membrane is applied to, in particular, a fuel cell wherein high-concentration methanol is used as a fuel. In the aromatic hydrocarbon based proton exchange membrane of the invention, the ion exchange capacity is set into the range of 0.6 to 1.3 meq/g. Moreover, the area swelling rate for a 30% by mass methanol aqueous solution at 40°C is set into the range of 2 to 30%. Preferably, a sulfonic acid group is bonded to an aromatic ring of the aromatic hydrocarbon based polymer contained in the aromatic hydrocarbon based proton exchange film. Preferably, the aromatic hydrocarbon based polymer is a polyarylene ether based polymer.
SULFONIC ACID GROUP-CONTAINING POLYMER, METHOD FOR PRODUCING SAME, RESIN COMPOSITION CONTAINING SUCH SULFONIC ACID GROUP-CONTAINING POLYMER, POLYMER ELECTROLYTE MEMBRANE, POLYMER ELECTROLYTE MEMBRANE/ELECTRODE ASSEMBLY, AND FUEL CELL
申请人:Toyo Boseki Kabushiki Kaisha
公开号:EP1889863A1
公开(公告)日:2008-02-20
The present invention relates to a sulfonic acid group-containing polymer excellent in ion conductivity and durability, a method for producing the same, a resin composition containing the sulfonic acid group-containing polymer, a polymer electrolyte membrane, a polymer electrolyte membrane/electrode assembly, and a fuel cell. The sulfonic acid group-containing polymer of the present invention, in a first embodiment, includes a constituent represented by the following chemical formula 1:
wherein X represents hydrogen or a monovalent cation species; Y represents a sulfone group or a ketone group; and n represents an arbitrary integer not less than 2.
本发明涉及一种离子传导性和耐久性极佳的含磺酸基聚合物、其生产方法、含有该含磺酸基聚合物的树脂组合物、聚合物电解质膜、聚合物电解质膜/电极组件和燃料电池。在第一个实施方案中,本发明的含磺酸基聚合物包括由以下化学式表示的成分 1:
其中 X 代表氢或一价阳离子种类;Y 代表砜基或酮基;n 代表不小于 2 的任意整数。
approach to generatecarbon-centeredradical intermediates, mainly relying on silyl and α-aminoalkyl radicals as halogen abstractors. More recently, ligated boryl radicals have also been proposed as effective halogen abstractors under visible-light irradiation. In this study, we describe the use of this approach to enable C(sp3)–C(sp2) bond formation via radical addition of carbon-centeredradicals generated