Zur Kondensationsreaktion transfixierter 1,3-Dicarbonylverbindungen mit 4-Pyronen
作者:G. Seitz、H. Mönnighoff
DOI:10.1002/ardp.19733061012
日期:——
Die Synthesevon Pyranylidenverbindungen aus transfixierten 1,3‐Dicarbonylverbindungen und 2,6‐Dimethyl‐4‐pyron bzw. 2,6‐Diphenyl‐1‐thio‐4‐pyron wird beschrieben.
A novel strategy for the functionalization and design of 4-methylene-4<i>H</i>-pyran merocyanines <i>via</i> enamination and 1,8-conjugate addition
作者:Dmitrii L. Obydennov、Alena E. Simbirtseva、Alexander S. Shirinkin、Mikhail Y. Kornev、Vyacheslav Y. Sosnovskikh
DOI:10.1039/d2ob01862d
日期:——
ubstituted pyrans are reactive intermediates and can be considered as a convenient synthetic tool for the construction of new merocyanines with tunable fluorescence (417–628 nm). The main strategies for the modification of the pyran moiety have been determined for the construction and targeted design of fluorophores. Pyrans bearing two enamine moieties demonstrate significant light extinction coefficients
4-Methylene-4 H - pyrans 是流行的部花青染料,但它们的功能化受到与芳香醛的 Knoevenagel 缩合的限制。在这项工作中,我们开发了一种基于烯化和随后的二甲基氨基亲核取代的新型吡喃荧光团构建方法1,8-共轭添加/消除。这种方法包括选择性转换,导致以前未知的对称和不对称结构。二甲氨基乙烯基取代的吡喃是反应性中间体,可被视为一种方便的合成工具,用于构建具有可调荧光(417-628 nm)的新部花青。吡喃部分修饰的主要策略已确定用于荧光团的构建和靶向设计。带有两个烯胺部分的吡喃表现出显着的消光系数(高达 116 000 M -1 cm -1)、高量子产率(高达 69%)和大斯托克斯位移(高达 152 nm),因为它们具有很强的推挽性质。密度泛函理论 (DFT) 计算用于解释制备的部花青的结构和光物理特征。所开发的方法可以被视为一个有用的平台,可进一步将 4-亚甲基-4
Letourneux; Sparfel; Roussakis, European Journal of Medicinal Chemistry, 1984, vol. 19, # 6, p. 535 - 540
作者:Letourneux、Sparfel、Roussakis、et al.
DOI:——
日期:——
5-(2,6-Bis((E)-4-(dimethylamino)styryl)-1-ethylpyridin-4(1H)-ylidene)-2,2-dimethyl-1,3-dioxane-4,6-dione: aggregation-induced emission, polymorphism, mechanochromism, and thermochromism
polymorphs were found to be mainly depended on their molecular conformations due to the weak intermolecularinteractions, as revealed by the single crystal structural analysis. More importantly, these three crystalline polymorphs showed different mechanochromic phenomena under different pressure. The fluorescent color changes of DHPM-o and DHPM-r upon gentle grinding were attributed to a crystal-to-crystal