Results 31 to 40 of about 79,802 (211)

Harnessing Ionic Interactions and Hydrogen Bonding for Nucleophilic Fluorination

Molecules, 2020
We review recent works for nucleophilic fluorination of organic compounds in which the Coulombic interactions between ionic species and/or hydrogen bonding affect the outcome of the reaction.
Young-Ho Oh, Hyoju Choi, Chanho Park, Dong Wook Kim, Sungyul Lee   +4 more
doaj   +1 more source

Phosphoramidite Gold(I)-Catalyzed Diastereo- and Enantioselective Synthesis of 3,4-Substituted Pyrrolidines [PDF]

, 2011
In this article the utility of phosphoramidite ligands in enantioselective AuI catalysis was explored in the development of highly diastereo- and enantioselective AuI-catalyzed cycloadditions of allenenes.
Benitez, Diego, Goddard, William A., III, González, Ana Z., Tkatchouk, Ekaterina, Toste, F. Dean   +4 more
core   +3 more sources

Substrate-Assisted Catalysis Unifies Two Families of Chitinolytic Enzymes [PDF]

, 1997
Hen egg-white lysozyme has long been the paradigm for enzymatic glycosyl hydrolysis with retention of configuration, with a protonated carboxylic acid and a deprotonated carboxylate participating in general acid-base catalysis.
Blake C. C. F., C−, Davies G. J., Ford L. O., Henrissat B., Iseli B., Johnson L. N., Jones T. A., Kirby A., Knapp S., Kobayashi S., Koshland D. E., Perrakis A., Phillips D. C., Piszkiewicz D., Rao V. H., Rozeboom H. J., Sinnot M. L., Strynadka N. C. J., Sulzenbacher G., Terwisscha van Scheltinga A. C., Terwisscha van Scheltinga A. C., Terwisscha van Scheltinga A. C., Tews I., Thunnissen A. M. W. H., Tronrud D. E., van Roey P., Vårum K. M., Weaver L. H.   +28 more
core   +3 more sources

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
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

Synthesis and characterisation of controllably functionalised polyaniline nanofibres [PDF]

, 2009
A novel method for functionalising solution based polyaniline (PAni) nanofibres is reported whereby the degree of side-chain attachment can be controllably altered.
Acevedo, Acevedo, Baker, Bao, Barbero, Barbero, Belzig, Blake, Byrne, Castro, Chiou, Chiou, Ci, Cui, Dermot Diamond, Drury, Emer Lahiff, Gordon G. Wallace, Goutev, Han, Huang, Huang, Hussain, Inoue, Jiang Yue, Krishnakumar, Lahiff, Li, Li, Liu, Luo, MacDiarmid, Masdarolomoor, Masdarolomoor, Mazeikiene, Moller, Nikoobakht, Roh, Salavagione, Small, Tran, Trevor Woods, Tseng, Virji, Virji, Virji, Virji, Werner Blau, Xingwei Li, Yasuda   +49 more
core   +1 more source

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 SNAr pathways respectively.
Martí Garçon, Clare Bakewell, Andrew J. P. White, Mark R. Crimmin   +3 more
openaire   +5 more sources

Diastereodivergent nucleophile–nucleophile alkene chlorofluorination

Nature Chemistry
AbstractThe selective hetero-dihalogenation of alkenes provides useful building blocks for a broad range of chemical applications. Unlike homo-dihalogenation, selective hetero-dihalogenation reactions, especially fluorohalogenation, are underdeveloped. Current approaches combine an electrophilic halogen source with a nucleophilic halogen source, which ...
Sayad Doobary, Andrew J. D. Lacey, Stephen G. Sweeting, Sarah B. Coppock, Henry P. Caldora, Darren L. Poole, Alastair J. J. Lennox   +6 more
openaire   +3 more sources

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   +1 more source

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