通常,空间正交轨道之间的远程电子通信效率低下,并且仅限于场和感应效应。在这项工作中,我们提供了实验证据,表明可以通过两个简并且相互正交的前沿分子轨道 (MO) 在过渡态的分子内电子转移来实现这种通信。当这些轨道之间的能隙接近零或“轨道交叉”时,正交轨道之间的相互作用被放大。两个空的或两个完全占据的 MO 之间的交叉不会导致稳定,当一个空的 MO 被填充(即电子注入)或填充的 MO 之一被减少(即空穴注入)时,可以“激活” )。在还原环芳构化反应中,这种交叉定义了具有由面内和面外 π 系统定义的能量的过渡态。在此,我们使用轨道交叉在烯二炔的还原性 C1-C5 环芳构化反应中为该概念的实用性提供了实验证据。与类似的自由基环化相比,通过轨道交叉与远程取代基的通信大大提高了闭环步骤的区域选择性。我们还提供了与电子注入苄基化烯二炔的效率有关的光物理数据。与类似的自由基环化相比,通过轨道交叉与远程取代
Environmentally Friendly and Recyclable CuCl2-Mediated C–S Bond Coupling Strategy Using DMEDA as Ligand, Base, and Solvent
作者:Guodong Shen、Xianqiang Huang、Qichao Lu、Zeyou Wang、Weiwei Sun、Yalin Zhang、Manman Sun、Zhiming Wang
DOI:10.1055/a-1561-5508
日期:2022.1
Simple reaction conditions and recyclable reagents are crucial for environmentally friendly industrial applications. An environment-friendly, recyclable and economic strategy was developed to synthesize diaryl chalcogenides by the CuCl2-catalyzed C–S bond-formation reaction via iodobenzenes and benzenethiols/1,2-diphenyldisulfanes using N,N′-dimethylethane-1,2-diamine (DMEDA) as ligand, base, and solvent
[EN] SUBSTITUTED CYCLIC AMIDES AND THEIR USE AS HERBICIDES<br/>[FR] AMIDES CYCLIQUES SUBSTITUÉS ET LEUR UTILISATION EN TANT QU'HERBICIDES
申请人:DU PONT
公开号:WO2016196593A1
公开(公告)日:2016-12-08
Disclosed are compounds of Formula 1, N-oxides of the compounds and salts of the compounds and N-oxides: wherein R1, R2, R3, R4, R5, R6, Q1, Q2, J, YI and Y2 are as defined in the disclosure. Also disclosed are compositions containing the compounds, N-oxides and salts, and methods for controlling undesired vegetation comprising contacting the undesired vegetation or its environment with an effective amount of such a compound, N-oxide, salt or composition.
[EN] GAMMA SECRETASE MODULATORS<br/>[FR] MODULATEURS DE GAMMA SECRÉTASE
申请人:SCHERING CORP
公开号:WO2010075203A1
公开(公告)日:2010-07-01
This invention provides novel compounds that are modulators of gamma secretase. The compounds have the formula (Chemical formula should be inserted here as it appears on abstract in paper form). Also disclosed are methods of modulating gamma secretase activity and methods of treating Alzheimer's Disease using the compounds of formula (I).
Carbon Monoxide-Free One-Step Synthesis of Isoindole-1,3-diones by Cycloaminocarbonylation of o-Haloarenes Using Formamides
作者:Dinesh N. Sawant、Yogesh S. Wagh、Kushal D. Bhatte、Bhalchandra M. Bhanage
DOI:10.1002/ejoc.201101000
日期:2011.11
A new carbonmonoxide-free, solvent-free, single step protocol for the synthesis of isoindole-1,3-diones from o-haloarenesusing palladium acetate and xantphos catalysis is reported. The wider applicability of this protocol for several types of o-iodoarenes and a few o-bromoarenes makes it attractive. Aryl iodides and aryl bromides provided moderate to excellent yields of up to 93 %.
Copper oxide nanoparticles have been applied as an efficient catalyst for the formation of C–N bonds. They can catalyze diaminations for the regiospecific synthesis of 1,2‐disubstituted benzimidazoles from 1,2‐dihaloarenes and N‐arylamidines. The best performance has been achieved using CuO nanoparticles with average diameter of 6.5 nm. In addition, the catalyst can be recycled and reused without any