已经制备了由交替的电子给体(D)和-受体(A)部分组成的主链共轭线性聚合物,目的是测试它们在单材料有机太阳能电池(SMOSC)中作为光敏组分的性能。D部分由在噻吩环的3位上带有己氧基,己氧基甲基或己基的联噻吩共单元构成,而A部分由苯并噻二唑基表示。D–A聚合物是通过要求不高的氧化FeCl 3聚合工艺以高收率获得的–分别从相关的前体4,7-双(3-己氧基噻吩-2-基)苯并[ c ] [2,1]开始,3]噻二唑,4,7-双[3-(6-甲氧基己基)噻吩-2-基]苯并[ c] [2,1,3]噻二唑和4,7-双(3-己基噻吩-2-基)苯并[ c ] [2,1,3]噻二唑–分馏后的分散指数低,接近单分散状态用甲醇。对该材料的物理和结构特性进行了全面表征,然后通过使用不同的光敏组分沉积程序,对SMOSC中的光转换效率进行了测试。与开尔文探针力显微镜(KPFM)测量一致,基于共轭3-烷氧基噻吩和苯并噻二唑
Metal-Free Oxidative Coupling Reactions via σ-Iodonium Intermediates: The Efficient Synthesis of Bithiophenes Using Hypervalent Iodine Reagents
作者:Koji Morimoto、Tomofumi Nakae、Nobutaka Yamaoka、Toshifumi Dohi、Yasuyuki Kita
DOI:10.1002/ejoc.201100969
日期:2011.11
The direct oxidative biaryl couplingreaction is an attractive tool for environmentally benign green chemistry. A novel direct method for the synthesis of bithiophene using a hypervalentiodinereagent has been developed. The reaction mechanism has also been investigated, casting light on the reaction intermediate and revealing the reactivity with iodonium salts.
Chemoselective, Scalable Nickel‐Electrocatalytic
<i>O</i>
‐Arylation of Alcohols
作者:Hai‐Jun Zhang、Longrui Chen、Martins S. Oderinde、Jacob T. Edwards、Yu Kawamata、Phil S. Baran
DOI:10.1002/anie.202107820
日期:2021.9.13
The formation of aryl-alkyl ether bonds through cross coupling of alcohols with aryl halides represents a useful strategic departure from classical SN2 methods. Numerous tactics relying on Pd-, Cu-, and Ni-based catalytic systems have emerged over the past several years. Herein we disclose a Ni-catalyzed electrochemically driven protocol to achieve this useful transformation with a broad substrate
通过醇与芳基卤的交叉偶联形成芳基-烷基醚键代表了对经典S N 2 方法的有用的战略偏离。过去几年出现了许多依赖钯基、铜基和镍基催化系统的策略。在此,我们公开了一种镍催化电化学驱动方案,以一种操作简单的方式在广泛的底物范围内实现这种有用的转化。这种电化学方法不需要强碱、昂贵的外源过渡金属催化剂(例如铱、钌),并且可以轻松地在批量或流动设置中扩大规模。有趣的是,与机械相关的光化学变体相比,电子醚化表现出增强的底物范围,因为它耐受醇亲核试剂中的叔胺官能团。
Heterogeneous Palladium-Catalyzed Synthesis of Aromatic Ethers by Solvent-Free Dehydrogenative Aromatization: Mechanism, Scope, and Limitations Under Aerobic and Non-Aerobic Conditions
derivatives and alcohols, both non-aromatic precursors, aryl ethers could be synthesized in good yields and with good selectivities in the presence of a catalytic amount of Pd/C, in one step, without added solvent, in a reaction vessel open to air. For less reactive substrates, the addition of 1-octene in a closed system undernon-aerobicconditions improved the conversion. In addition, the catalyst could
Nucleophilic <i>ipso</i>-Substitution of Aryl Methyl Ethers through Aryl C–OMe Bond Cleavage; Access to Functionalized Bisthiophenes
作者:Abhishek Kumar Mishra、Ajay Verma、Srijit Biswas
DOI:10.1021/acs.joc.6b02701
日期:2017.4.7
A metal and solvent free strategy to functionalize aryl methyl ethers through direct nucleophilicsubstitution of aryl C–OMe bond has been described. A wide range of O, S, N, and C-centered uncharged nucleophiles has been successfully employed. Using this protocol, functional derivatives of bisthiophene have been synthesized in a straightforward way. The reactions are highly atom-efficient and generate