Results 31 to 40 of about 48,033 (274)

Nucleophiles, nucleophilicity and relationship between nucleophilicity and basicity

, 2009
Department of Chemistry, Midnapur College, Paschim Medinipur-721 101, West Bengal, India Department of Chemistry, Vidyasagar University, Paschim Medinipur-721 102, West Bengal, India Manuscript received 17 March 2009, accepted 11 June 2009 The concept of nucleophilicity and electrophilicity are most useful in understanding polar reactions.
Tridib Tripathy, B. R. De
openaire   +2 more sources

The acid-base-nucleophile catalytic triad in ABH-fold enzymes is coordinated by a set of structural elements.

PLoS ONE, 2020
The alpha/beta-Hydrolases (ABH) are a structural class of proteins that are found widespread in nature and includes enzymes that can catalyze various reactions in different substrates.
Alexander Denesyuk, Polytimi S Dimitriou, Mark S Johnson, Toru Nakayama, Konstantin Denessiouk   +4 more
doaj   +1 more source

Quantitative analysis of micellar effect on the reaction rate of cationic triphenylmethine dyes with water according to Berezin’s model

Вісник Харківського національного університету: Серія xімія, 2020
Several approaches quantitatively describe the effect of surfactant micellar solution on the reaction rate. The most used among them are Piszkiewicz’s, Berezin’s, and Pseudophase Ion-Exchange (PIE) models.
Anna Laguta
doaj   +1 more source

Probing the Catalytic Mechanism of Vibrio harveyi GH20 β-N-Acetylglucosaminidase by Chemical Rescue. [PDF]

PLoS ONE, 2016
Vibrio harveyi GH20 β-N-acetylglucosaminidase (VhGlcNAcase) is a chitinolytic enzyme responsible for the successive degradation of chitin fragments to GlcNAc monomers, activating the onset of the chitin catabolic cascade in marine Vibrios.Two invariant ...
Piyanat Meekrathok, Wipa Suginta
doaj   +1 more source

Definition of a Nucleophilicity Scale

The Journal of Physical Chemistry A, 2006
This work deals with exploring some empirical scales of nucleophilicity. We have started evaluating the experimental indices of nucleophilicity proposed by Legon and Millen on the basis of the measure of the force constants derived from vibrational frequencies using a probe dipole H-X (X = F,CN).
Jaramillo, Paula, Domingo, Luis R., Contreras Ramos, Renato, Tiznado Vásquez, William, Fuentealba Rosas, Patricio   +4 more
openaire   +8 more sources

Unravelling nucleophilic aromatic substitution pathways with bimetallic nucleophiles [PDF]

Chemical Communications, 2019
Reaction of nucleophiles containing polar (Fe–Mg) and apolar (Mg–Mg) bonds with 2-(pentafluorophenyl)pyridine are calculated to proceed by stepwise and concerted S N Ar pathways respectively.
Martí Garçon, Clare Bakewell, Andrew J. P. White, Mark R. Crimmin   +3 more
openaire   +4 more sources

Inventory of interactions that participate in the proper positioning of the catalytic histidine next to the catalytic nucleophile in 40 ABH fold enzyme families.

, 2020
The main-chain oxygen atom of residue XIV interacts with both the catalytic histidine and the catalytic nucleophile (column CA/Nucleophile–O/XIV), orienting the imidazole ring of the catalytic histidine with respect to the side-chain of the catalytic ...
Polytimi S. Dimitriou (8479038), Konstantin Denessiouk (201123), Alexander Denesyuk (201118), Mark S. Johnson (166934), Toru Nakayama (401351)   +4 more
core   +1 more source

Electrochemical Study of Esculetin Nitration by Digital Simulation of Cyclic Voltammograms

Journal of Chemistry, 2013
The reaction of electrochemically generated o-quinones from oxidation of esculetin as Michael acceptor with nitrite ion as nucleophile has been studied using cyclic voltammetry. The reaction mechanism is believed to be EC, including oxidation of catechol
Lida Khalafi, Mohammad Yari, Farzaneh Yadaei, Shabnam Majidzade   +3 more
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Electrochemical oxidative difunctionalization of diazo compounds with two different nucleophiles

Nature Communications, 2023
The difunctionalization of diazo compounds, traditionally with one nucleophile and one electrophile, is a powerful strategy. Here, the authors develop a path of electrochemical oxidative difunctionalization of diazo compounds with two different ...
Dongfeng Yang, Zhipeng Guan, Yanan Peng, Shuxiang Zhu, Pengjie Wang, Zhiliang Huang, Hesham Alhumade, Dong Gu, Hong Yi, Aiwen Lei   +9 more
doaj   +1 more source

Emerging experimental and computational methods for studying redox‐regulated structural transitions

FEBS Letters, EarlyView.
Redox reactions can reshape proteins and alter how they behave in cells, with important consequences for health and disease. This review explores emerging experimental and computational approaches for discovering these redox‐sensitive protein switches, revealing their structural effects, and predicting their behavior, opening new opportunities to ...
Tasneem Rass, Dana Reichmann, Gábor Erdős   +2 more
wiley   +1 more source