A novel conformationally adaptive macrocyclic tetramaleimide with flipping pyrene sidewalls
作者:Lingyun Zhu、Wei Zeng、Menghua Li、Meijin Lin
DOI:10.1016/j.cclet.2021.06.003
日期:2022.1
conformationally adaptive macrocycles are described. This new type of conformationally adaptive macrocycle was constructed through Perkin reaction, followed by imidization. By changing the condensation partner as the linking unit, a family of conjugated macrocycles with different sizes of the cavity was synthesized, which provide a simple and modular syntheticstrategy towards the conformationally adaptive macrocycles
描述了基于芘的构象适应性大环化合物的合成、结构和性质。这种新型的构象适应性大环是通过珀金反应构建的,然后是酰亚胺化。通过改变缩合伙伴作为连接单元,合成了一系列具有不同腔尺寸的共轭大环,这为构象适应性大环提供了一种简单且模块化的合成策略。此外,大环通过翻转芘亚基提供两个明确定义的构象,这是通过单晶 X 射线衍射分析明确确定的。构象相互转换势垒由密度泛函理论 (DFT) 计算确定。这个新的大环也表现出独特的性质,如汽色行为和聚集发射增强效应。此外,我们还研究了接头对所得大环产物的形状和光物理性质的影响。
Dipyreno- and diperyleno-anthracenes from glyoxylic Perkin reactions
作者:Parantap Sarkar、Fabien Durola、Harald Bock
DOI:10.1039/c3cc44044c
日期:——
Twofold Perkin condensation of 2,5-dibromophenylene-1,4-diacetic acid with arylglyoxylic acids followed by cyclo-dehydrobromination leads to dipyreno- and diperyleno-anthracene tetraesters and diimides. The imides show surprisingly large absorption shifts versus the esters, illustrating that electron-withdrawing substituents at the anthracene unit efficiently impart long wavelength absorption in such electron-deficient graphene nanoribbon fragments.
Monoprotection of arylene‐diacetic acids allows the formation of flexible five‐block precursors by multiple Perkin reactions. Final graphitization of these precursors leads to elongated octasubstituted polycyclic arenes, such as a [14]phenacene octaester.
Merging Photocatalytic Doubly‐Decarboxylative C<sub>sp</sub><sup>2</sup>−C<sub>sp</sub><sup>2</sup> Cross‐Coupling for Stereo‐Selective (<i>E</i>)‐<i>α</i>,<i>β</i>‐Unsaturated Ketones Synthesis
作者:Subal Mondal、Siba P. Midya、Soumya Mondal、Suman Das、Pradyut Ghosh
DOI:10.1002/chem.202303337
日期:2024.1.26
cross-coupling reaction. Present catalytic system efficiently cross-coupled α, β-unsaturatedacids and α-keto acids to a variety of α, β-unsaturated ketones with excellent E-selectivity and functional group tolerance. In this merging catalysis, photocatalyst implicated through reductive quenching cycle whereas cross coupling proceeded over one electron oxidative pallado-cycle in a tandem pathway.