α,β-Diarylacrylonitrile derivatives can be prepared by two different routes: (1) the intermolecular condensation of the same arylacetonitriles (2) the condensation of arylaldehydes and arylacetonitriles with a catalytic amount of NaOCH3 at room temperature. Several α,β-diarylacrylonitrile derivatives have been synthesised in this paper and characterised. The UV-vis absorption and photoluminescent (PL)
Catalytic α-olefination of nitriles using primary alcohols, via dehydrogenative coupling of alcohols with nitriles, is presented. The reaction is catalyzed by a pincer complex of an earth-abundant metal (manganese), in the absence of any additives, base, or hydrogen acceptor, liberating dihydrogen and water as the only byproducts.
Fast photoactuation of elastic crystals based on 3-(naphthalen-1-yl)-2-phenylacrylonitriles triggered by subtle photoisomerization
作者:Cheng Liu、Kaiqi Ye、Zhonglin Wei、Jiang Peng、Huan Xiao、Jingbo Sun、Ran Lu
DOI:10.1039/d2tc02667h
日期:——
molecular width after the photochemical reaction and strong intermolecular interactions to amplify the deformation at the molecular level into the macroscopic mechanical motion of the crystals. Therefore, the crystals performed reversible photo-induced bending and unbending by turning around the irradiation directions more than 100 times on account of the retained crystal integrity during photoactuation and
通过Knoevenagel缩合反应合成了一系列( Z )-3-(naphthalen-1-yl)-2-苯基丙烯腈衍生物。光异构化发生在分子晶体中,这会触发晶体从光源迅速向后弯曲。特别是,在紫外线照射的最初几秒钟内观察到显着的光机械运动,在此期间,从Z - 到E - 异构体的转化率小于ca。0.4%。这种由微妙的光异构化引起的快速光致动可能源于光化学反应后分子宽度的较大变化和强烈的分子间相互作用,从而将分子水平的变形放大为晶体的宏观机械运动。因此,由于在光致动过程中保持了晶体的完整性和晶体的良好弹性,晶体通过将照射方向翻转 100 次以上进行了可逆的光致弯曲和伸直。针状晶体在水中也表现出光机械效应。这种光化学反应驱动的光机械分子晶体可以在许多实际应用场景中用作致动器。
Oxygen-Dependent Ligand-Controlled Iron-Catalyzed Chemoselective Synthesis of Olefins and Vinyl Nitriles
作者:Amit Kumar Guin、Subhajit Chakraborty、Subhankar Khanra、Santana Chakraborty、Nanda D. Paul
DOI:10.1021/acs.orglett.4c00455
日期:2024.4.5
An oxygen-dependent ligand-controlled chemoselective synthesis of vinyl nitriles and E-olefins by coupling a variety of alcohols and benzyl cyanides, catalyzed by a well-characterized, air-stable, easy-to-prepare Fe(II) catalyst (1a) bearing a redox-active arylazo pincer (L1a) is reported. The azo-moiety of the ligand backbone acts as an electron and hydrogen reservoir, enabling catalyst 1a to efficiently
在特征良好、空气稳定、易于制备的 Fe(II) 催化剂的催化下,通过偶联多种醇和苯乙腈,进行乙烯基腈和E-烯烃的氧依赖性配体控制化学选择性合成 ( 1a )据报道,其具有氧化还原活性芳基偶氮钳( L 1a )。配体主链的偶氮部分充当电子和氢储存库,使催化剂1a能够分别在氧气和氩气气氛下选择性地以中等至良好的产率有效地生产广谱乙烯基腈和E-烯烃。
Pyrenedione-Catalyzed α-Olefination of Nitriles under Visible-Light Photoredox Conditions