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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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深度红移和双晶的计算设计和合成

David B Konrad1,2,3, Gökcen Savasci2,4, Lars Allmendinger1

  • 1Department of Pharmacy, Ludwig-Maximilians-University Munich, Butenandtstraße 5-13, Munich 81377, Germany.

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概括

我们通过计算设计了一种卓越的亚博光开关. 新的二--二- (dfdc) 亚博为生物光学应用提供了对光诱导异构体生成的增强控制.

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科学领域:

  • 摄影化学
  • 有机化学
  • 材料科学

背景情况:

  • 由于其可逆光诱导的异构化,阿佐被广泛用作光开关.
  • 阿佐的光物理特性对芳香环上的替代模式非常敏感.
  • 了解结构属性关系对于设计先进的亚博衍生物至关重要.

研究的目的:

  • 通过计算来研究正氧化对阿佐光物理性能的电子和几何效应.
  • 设计并通过计算验证一种具有改进光交换特性的新型亚博衍生物.
  • 通过实验合成和表征设计的亚博,用于潜在的生物光学应用.

主要方法:

  • 计算分析 (例如,DFT计算) 来研究电子和几何影响.
  • 通过X射线结晶学来确定分子结构和灵活性.
  • 紫外线吸收光谱和核磁共振 (NMR) 光谱用于实验性表征.
  • 通过二重C-H激活进行正合成.

主要成果:

  • 化导致红移几何形状和延长的n → π*带尾巴.
  • 甲可具有形状的灵活性,使其具有红移几何形状.
  • 设计的二-二- (dfdc) 亚博与四-亚博相比表现优越.
  • 实验性表征证实了dfdc亚博的结构和光物理特性.
  • Dfdc亚博呈现出近位稳定的异构体和增加的n → π*带分离.
  • 在绿色/黄色和红色光线下可以实现高水平的cis异构体生成.

结论:

  • 对替模式的计算洞察力是设计高效的阿佐光开关的关键.
  • 新型dfdc亚博显示了增强的光物理性质,包括改善的异构体控制.
  • 开发的亚博适合在生物光学窗口内使用光的应用.
  • 这项工作为合理设计具有定制光交换能力的亚博衍生物提供了途径.