Copper-Facilitated Suzuki Reactions: Application to 2-Heterocyclic Boronates
摘要:
The palladium-catalyzed Suzuki-Miyaura reaction has been utilized as one of the most powerful methods for C-C bond formation. However, Suzuki reactions of electron-deficient 2-heterocyclic boronates generally give low conversions and remain challenging. The successful copper(l) facilitated Suzuki coupling of 2-heterocyclic boronates that is broad in scope Is reported. Use of this methodology affords greatly enhanced yields of these notoriously difficult couplings. Furthermore, mechanistic investigations suggest a possible role of copper in the catalytic cycle.
Supramolecular Copolymers Under Kinetic, Thermodynamic, or Pathway‐Switching Control
作者:Yan Chen、Yusheng Shi、Zhanming Gao、Lei Wang、Yutian Tang、Jinxuan Liu、Chun Liu
DOI:10.1002/anie.202302581
日期:2023.7.10
Studying the self-assemblymechanisms and kinetic pathways of IrIII complex monomers has led to their block co-assembly through kinetic control and pathway-switching control, respectively. The well-defined block microstructure has been characterized by TEM and SEM. The present research approach will be an important step forward in the study of the self-assembly of small molecules that can form crystalline
研究 Ir III配合物单体的自组装机制和动力学途径,分别通过动力学控制和途径切换控制实现了它们的嵌段共组装。清晰的块体微观结构已通过 TEM 和 SEM 进行了表征。目前的研究方法将是研究可形成晶体组装体的小分子自组装的重要一步。
Systematic evaluation of HOMO energy levels for efficient dye regeneration in dye-sensitized solar cells
and N^O = pyridinecarboxylate and its derivatives) were synthesized and evaluated to identify the highest occupied molecular orbital (HOMO) energylevel (EHOMO) for efficient dye regeneration in dye-sensitizedsolarcells. EHOMO of these complexes was systematically tuned by changing the electron-donating ability of the C^N and N^O ligands. For complexes with an EHOMO in the potential range more negative
合成了[Ru(tctpy)(C ^ N)NCS类型和[Ru(tctpy)(N ^ O)NCS]类型的30种钌配合物(C ^ N =环金属配体,N ^ O =吡啶羧酸酯及其衍生物)并进行了评估,以确定在染料敏化太阳能电池中有效进行染料再生的最高占据分子轨道(HOMO)能级(E HOMO)。通过改变C ^ N和N ^ O配体的给电子能力,系统地调节了这些配合物的E HOMO。用于与络合物Ë HOMO在电位范围内时小于0.5V更负相对于饱和甘汞电极(SCE),与正移位增加入射光子-电流转换效率(IPCE)Ë HOMO但不能超过70%,这表明快速的染料再生是困难的。在另一方面,高IPCE上70%以上,用于与复合物经常观察Ë HOMO比0.5伏更积极与SCE。由此可以得出结论:有近0.5伏有效的电子转移的阈值相对于SCE(Δ G ^ 2为系列这些敏化剂的≈0.3电子伏特)。
Copper-Facilitated Suzuki Reactions: Application to 2-Heterocyclic Boronates
作者:James Z. Deng、Daniel V. Paone、Anthony T. Ginnetti、Hideki Kurihara、Spencer D. Dreher、Steven A. Weissman、Shaun R. Stauffer、Christopher S. Burgey
DOI:10.1021/ol802556f
日期:2009.1.15
The palladium-catalyzed Suzuki-Miyaura reaction has been utilized as one of the most powerful methods for C-C bond formation. However, Suzuki reactions of electron-deficient 2-heterocyclic boronates generally give low conversions and remain challenging. The successful copper(l) facilitated Suzuki coupling of 2-heterocyclic boronates that is broad in scope Is reported. Use of this methodology affords greatly enhanced yields of these notoriously difficult couplings. Furthermore, mechanistic investigations suggest a possible role of copper in the catalytic cycle.