Results 1 to 10 of about 2,243 (142)

Micro‐Environment Programmable Quinoline COFs for High‐Performance Photocatalytic H2O2 Generation and Benzylamine Coupling [PDF]

Advanced Science
Photocatalytic H2O2 synthesis from water and oxygen by covalent organic frameworks (COFs) has attracted much attention currently. However, conventional COFs often suffer from insufficient stability and activity due to the unclear structure‐activity ...
Mengchao Guo, Chao He, Zihe Wu, Yu Tian, Jiani Yang, Yujie Wang, Hao Wu, Jin Yang, Min Xu, Weichao Xue, Chong Cheng, Shuang Li, Changsheng Zhao   +12 more
doaj   +2 more sources

A Theoretical Study of the Relationship between the Electrophilicity ω Index and Hammett Constant σp in [3+2] Cycloaddition Reactions of Aryl Azide/Alkyne Derivatives

Molecules, 2016
The relationship between the electrophilicity ω index and the Hammett constant σp has been studied for the [2+3] cycloaddition reactions of a series of para-substituted phenyl azides towards para-substituted phenyl alkynes. The electrophilicity ω index—a
MIGUEL Julve, Luis R Domingo, Hicham Ben El Ayouchia   +2 more
exaly   +3 more sources

6,6'-Biazulenic core as a platform for unlocking Hammett constants <i>via</i> electrochemical free-energy relationships. [PDF]

RSC Adv
Functionalization along the molecular axis of 6,6′-biazulene enables electrochemical Hammett analysis, precise redox tunability, and probing of long-range π-communication.
Mandigo JA, Kelsey SR, Applegate JC, Sabala RC, Dairo MK, Weghorn CR, Fair R, Berrie CL, Thompson WH, Janzen DE, Barybin MV.   +10 more
europepmc   +3 more sources

Relationship between electrophilicity index, Hammett constant and nucleus-independent chemical shift

Journal of Chemical Sciences, 2005
Inter-relationships between the electrophilicity index (Ω), Hammett constant (op@#@) and nucleusindependent chemical shift (NICS (1) — NICS value one angstrom above the ring centre) have been investigated for a series of meta- and para-substituted benzoic acids. Good linear relationships between Hammett constant vs electrophilicity and Hammett constant
Ramakrishnan Parthasarathi, Utpal Sarkar, V Subramanian   +2 more
exaly   +3 more sources

Structural reactivity relationship and thermokinetic investigation of oxidation of substituted anilines by iridium (IV) in solution media [PDF]

Scientific Reports
The oxidation of para- and ortho-substituted anilines with iridium (IV) in aqueous perchloric acid has been investigated. The kinetic study reveals a first-order dependence with respect to both the oxidant and the substrates.
Riya Sailani
doaj   +2 more sources

On the analysis of oxidative deamination with the help of the Hammett relationship and other linear free energy relationships

CHIMIA, 1971
E.A. Zeller, M. Hsu, P.K. Li
doaj   +2 more sources

The Ambivalent Object(s) of America in Wim Wenders

CINEJ Cinema Journal, 2022
This article will consider Wim Wenders’ relationship to America in several of his films during the New German Cinema Movement of the 1970s and 1980s. In particular, it will explore the place America occupies as a fantasy object, framing this through the ...
Laurent Shervington
doaj   +1 more source

Hammett Correlation in the Accelerated Formation of 2,3-Diphenylquinoxalines in Nebulizer Microdroplets

Molecules, 2021
The accelerated formation of 2,3-diphenylquinoxalines in microdroplets generated in a nebulizer has been investigated by competition experiments in which equimolar quantities of 1,2-phenylenediamine, C6H4(NH2)2, and a 4-substituted homologue, XC6H3(NH2)2
Nathan W. Fenwick, Richard Telford, Amie Saidykhan, William H. C. Martin, Richard D. Bowen   +4 more
doaj   +1 more source

Interdependence of the Hammett and isokinetic relationships: a numerical simulation approach

Monatshefte für Chemie - Chemical Monthly, 2021
Many homologous reaction series present linear correlations between the enthalpy (ΔHo≠,i) and entropy (ΔS o≠,i) of activation (kinetic compensation effect), the slope being the isokinetic temperature of the series (Tiso), so that at T = Tiso, all the reactions of the family share the same value of the rate constant. However, the random errors committed
Joaquin F. Perez-Benito, Arnau Clavero-Masana   +1 more
openaire   +2 more sources

Structure-reactivity correlation for the kinetics of the reaction of substituted 4-phenyl-1,4-dihydropyridines formation [PDF]

Journal of the Serbian Chemical Society, 2013
Quantitative structure-reactivity correlations for the kinetics of the Hantzsch's synthesis of substituted 4-phenyl-1,4-dihydropyridines in the reaction between ethyl m- and p-substituted benzylidene acetoacetate and enamine has been studied ...
Urošević Jovica V., Drmanić Saša Ž., Nikolić Jasmina B., Juranić Ivan O., Jovanović Bratislav Ž.   +4 more
doaj   +1 more source