Results 31 to 40 of about 2,266 (161)

Dynamic Effects May Affect Hammett Linear Free Energy Relationship [PDF]

, 2019
The aromatic nucleophilic substitution reaction in the Clayden rearrangement reaction has an abnormal Hammett linear free energy relationship1. Inspired by the concertedstepwise variation of the aromatic nucleophilic substitution reaction in 20182, we determined the mechanism of Clayden rearrangement reaction under several conditions by DFT calculation
Xinyu Xu, Zongchang Han
openaire   +1 more source

Personalized Network‐Guided Neuromodulation Enhances Human Working Memory

Advanced Science, EarlyView.
A personalized neuromodulation framework combining individualized functional brain network targeting with real‐time neural decoding is introduced. Using concurrent TMS–fMRI, participant‐specific stimulation targets and optimal frequencies are identified. Only optimal‐frequency stimulation improves working memory across sessions.
Ahsan Khan, Hongming Li, Camille Blaine, Julie Grier, Ethan Hammett, Almaris Figueroa‐Gonzalez, Sarai Garcia, Romain Duprat, Justin Reber, Joseph Deluisi, Christos Davatzikos, Theodore D. Satterthwaite, Yong Fan, Desmond J. Oathes   +13 more
wiley   +1 more source

Theoretical Study of Electron Transfer Process Between Fullerenes and Membrane Cells of Helicobacter pylori

International Journal of Electrochemical Science, 2016
The difference of the electrical potential across the membrane of Helicobacter pylori has applied to investigate the electron transfer between the membrane cells of Helicobacter pylori bacteria and the selected fullerenes Cn.
Nargese Zolfaghar Karahrudi, Avat (Arman) Taherpour   +1 more
doaj   +1 more source

L’intertexte entre le réel et l’imaginaire dans le cinéma de Wim Wenders

Fotocinema: Revista Científica de Cine y Fotografía, 2013
Cet article interroge la façon dont le cinéma représente à l’écran la frontière qui existe entre le monde imaginaire des personnages et celui qu’on appelle « monde réel ». Afin de vérifier la figuration à l’écran de cette relation parfois contradictoire,
Gustavo Coura Guimarães
doaj   +3 more sources

Dual‐Substrate Synergistic Photocatalysis: Exogenous Reagent‐Free Co‐Removal of Phenol and Cr(VI) via Electron‐Donor‐Mediated Redox Coupling over Modified Carbon Nitride

Advanced Science, EarlyView.
An exogenous reagent‐free dual‐substrate strategy harnesses phenol as an intrinsic electron donor to drive synchronous phenol degradation and Cr(VI) reduction over modified carbon nitride. π–π stacking and hydrogen bonding direct electron transfer to the catalyst, enriching photogenerated electrons and accelerating Cr(VI) reduction 6.4‐fold. This waste‐
Xiaoman Zhang, Qiyu Wang, Xiaodan Liu, Shuqi Wan, Cuiwei Du, Qilu Li, Chongfei Yu, Shuying Dong, Xianfa Su, Chun Hu   +9 more
wiley   +1 more source

Nickel‐Catalyzed Three‐Component Difluoroalkylation‐Amination for the Direct Access to Anti‐Inflammatory β‐Difluoroalkyl Amines

Advanced Science, EarlyView.
A nickel‐catalyzed three‐component reductive fluoroalkylation‐amination strategy of N‐vinylamides for the direct access to the α‐amidyl‐β‐difluoroalkyl amines was reported here. The synthetic method features with broad substrate scope, mild conditions, high functional group tolerance, and convenience to handle.
Chang Xu, Fangting Ma, Fan Ding, Luyan Wang, Yunxi Li, Yunzhi He, Xingang Zhang, Siyu He, Dandan Liu   +8 more
wiley   +1 more source

The Internal Relation between Quantum Chemical Descriptors and Empirical Constants of Polychlorinated Compounds

Molecules, 2018
Quantum chemical descriptors and empirical parameters are two different types of chemical parameters that play the fundamental roles in chemical reactivity and model development.
Jiangchi Fei, Qiming Mao, Lu Peng, Tiantian Ye, Yuan Yang, Shuang Luo   +5 more
doaj   +1 more source

Anion‐Bridged Dual Hydrogen Bond Enabled Concerted Addition of Phenol to Glycal

Advanced Science
A noncovalent organocatalytic concerted addition of phenol to glycal is developed for the stereoselective and regioselective construction of biologically important phenolic 2‐deoxyglycosides, featuring wide substrate tolerance.
Qinbo Jiao, Zhenbo Guo, Mingwen Zheng, Wentao Lin, Yujie Liao, Weitao Yan, Tianfei Liu, Chunfa Xu   +7 more
doaj   +1 more source

Sonochemical Synthesis of Cobalt‐Oxo‐Cubanes as Redox‐Active Platform for Proton‐Coupled Electron Transfer

Chemistry – A European Journal, EarlyView.
A facile sonochemical method for rapid and gram‐scale synthesis of ligand‐tunable cobalt‐oxo‐cubanes is reported. Electrochemical studies reveal a Co4O4‐centered one‐electron oxidation and PCET pathway, while identifying Co2+ impurities as key disruptors of true cubane redox chemistry.
Satyapriya Nath, Amjath Nihal Thiruthimmal, Tapan Ping, Sankalpa N. Panda, Loknath Patro, Jeebanjyoti Mohapatra, B. L. Bhargava, Bikash Kumar Jena, Bishnu P. Biswal   +8 more
wiley   +1 more source

Relationship between Dissociation Constants of the Amino Group of NI-Arylsulfanilamides and the Hammett Equation

Nippon kagaku zassi, 1963
19種のNl-アリールスルファニルアミドのアミノ基の解離定数(KNH3+;ArNHSO2C6H4NH3++H20 ArNHSO2C6H4.NH2+H30+)を27°±1°C,イオン強度0.2で吸収スペクトル法を用いて正確に測定し,Hammett則との関係を検討した。その結果,この解離には通常のHammett則は適用されないで,次式に示すような補正則が適用されることが見いだされた。10gKNH3+=0.212(σ+0.48ΔσR-)-1.8154ΔσR=-σ'-σ正常なHammett則が適用されないで,この補正則が適用されるということは,アリール基のρ位の電子吸引基の付加的共鳴寄与が-NHSO2-を経てアミノ基に伝わることを示している。一方吸収スペクトルとρ値の検討から-NHSO2-は-C=C ...
Mitsuru YOSHIOKA, Kaname HAMAMOTO, Tanekazu KUBOTA   +2 more
openaire   +2 more sources