Synthesis and electroluminescence properties of white-light single polyfluorenes with high-molecular weight by click reaction
作者:Chih-Nan Lo、Chain-Shu Hsu
DOI:10.1002/pola.24772
日期:2011.8.1
blue‐light polymer (PFB2) end‐capped with azide groups can easily react with acetylene end‐capped polymers (PFB1, PFG1, and PFR1, which are emitting blue‐, green‐ and red‐light, respectively) to form triazole‐ring linkages in polar solvents such as N,N‐dimethylforamide/toluene co‐solvent at moderate temperature of 100 °C, even without metal‐catalyst. Several WPFs that consist of these four basic polymers
Convenient Entry to <sup>18</sup>
F-Labeled Amines through the Staudinger Reduction
作者:E. Johanna L. Stéen、Vladimir Shalgunov、Christoph Denk、Hannes Mikula、Andreas Kjaer、Jesper L. Kristensen、Matthias M. Herth
DOI:10.1002/ejoc.201801457
日期:2019.2.28
amino‐functionalized synthons is a convenient and versatile approach to synthesize a broad variety of PET tracers. Herein, we report a method to convert 18F‐labeled azides to primary amines by means of the Staudingerreduction. Aliphatic and aromatic 18F‐labeled azides were converted into the corresponding amines with high conversion yields. The method was easily automated. From a broader perspective, the applied
Fluorine-18 在正电子发射断层扫描 (PET) 成像中具有出色的衰变特性。因此,它非常适合临床应用。因此,改进将氟-18纳入生物活性分子的策略至关重要。使用氨基功能化合成子进行间接 18F 标记是合成各种 PET 示踪剂的一种方便且通用的方法。在此,我们报告了一种通过施陶丁格还原将 18F 标记的叠氮化物转化为伯胺的方法。脂肪族和芳香族18F标记的叠氮化物被转化为相应的胺,转化率很高。该方法很容易实现自动化。从更广泛的角度来看,所应用的策略从单个前体产生两个有用的合成子,从而增加了以最少的合成工作标记不同化学支架的灵活性。
Catalytic Synthesis of Conjugated Azopolymers from Aromatic Diazides
作者:John M. Andjaba、Christopher J. Rybak、Zhiyang Wang、Jianheng Ling、Jianguo Mei、Christopher Uyeda
DOI:10.1021/jacs.1c00447
日期:2021.3.17
Conjugated polymers containing main chain azoarene repeat units are synthesized by a dinickel catalyzed N=N coupling reaction of aromatic diazides. The polymerization exhibits broad substrate scope and is compatible with heterocycles commonly featured in high performance organic materials, including carbazole, thiophene, propylenedioxythiophene (ProDOT), diketopyrrolopyrrole (DPP), and isoindigo. Copolymerizations
Synthesis and Photophysical Properties of Biphenyl and Terphenyl Arylene–Ethynylene Macrocycles
作者:Andrew L. Korich、Ian A. McBee、Jonathan C. Bennion、Jenna I. Gifford、Thomas S. Hughes
DOI:10.1021/jo4023809
日期:2014.2.21
A series of single-walled carbon nanotube precursors, C-3h-symmetric cyclotri(ethynylene)(bipheny1-2,4'-diyl) and cyclotri(ethynylene)(p-terphenyl-2,4 ''-diyl), have been prepared by a linear stepwise oligomerization-cyclization route and by statistical intermolecular cyclooligomerization. In addition to producing these members of a novel class of arylene ethynylene macrocycles, 1 and 2, the latter statistical process produces the smaller cyclic dimer, cyclodi(ethynylene)(p-terphenyl-2,4 ''-diyl) and the larger cyclic tetramer cyclotetra(ethynylene)(bipheny1-2,4'-diyl). These macrocycles display large Stokes shifts in their fluorescence spectra. Their biphenyl or terphenyl connectivity prevents these macrocycles from achieving full planarity in the ground state, and the ethynylene moieties could provide synthetic access to cyclic arylene oligomers and discrete carbon nanotube segments.
Catalytic Azoarene Synthesis from Aryl Azides Enabled by a Dinuclear Ni Complex
作者:Ian G. Powers、John M. Andjaba、Xuyi Luo、Jianguo Mei、Christopher Uyeda
DOI:10.1021/jacs.8b00503
日期:2018.3.21
machines and biologically active compounds. Here, we report a catalytic nitrene dimerization reaction that provides access to structurally and electronically diverse azoarenes. The reaction utilizes arylazides as nitrene precursors and generates only gaseous N2 as a byproduct. By circumventing the use of a stoichiometric redox reagent, a broad range of organic functional groups are tolerated, and common
偶氮芳烃是有价值的发色团,已被广泛用作分子机器和生物活性化合物中的光开关元件。在这里,我们报告了一种催化氮烯二聚反应,该反应提供了结构和电子上多样化的偶氮芳烃。该反应使用芳基叠氮化物作为氮烯前体并仅产生气态 N2 作为副产物。通过避免使用化学计量氧化还原试剂,可以容忍广泛的有机官能团,并且避免了当前方法的常见副产物。发现具有 Ni-Ni 键的催化剂相对于仅包含单个 Ni 中心的催化剂具有独特的效果。描述了这种核效应的机械起源。