Results 31 to 40 of about 61,221 (238)

Highly Electron-Deficient Pyridinium-Nitrones for Rapid and Tunable Inverse-Electron-Demand Strain-Promoted Alkyne-Nitrone Cycloaddition to Bicyclo[6.1.0]nonyne [PDF]

, 2019
Highly accelerated inverse-electron-demand strain-promoted alkyne-nitrone cycloaddition (IED SPANC) between a sta- ble cyclooctyne (bicyclo[6.1.0]nonyne (BCN)) and nitrones delocalized into a Cα-pyridinium functionality is reported, with the ...
Alexander M., Polgar, Praveen, Gunawardene, Wilson, Luo, Mark, Workentin, John F., Corrigan   +4 more
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Catalytic reactions of pyridinium and iminium ions

, 2022
Watson, Mary P.The dissertation focuses on transition metal catalysis of cationic species to make C-C bonds. ☐ Chapter 1 describes a nickel-catalyzed Suzuki-Miyaura cross-coupling of benzylic pyridinium salts. The pyridinium salts act as electrophiles in
Guan, Weiye
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Synthesis, biological evaluation, and computational studies of N-benzyl pyridinium–curcumin derivatives as potent AChE inhibitors with antioxidant activity

Journal of Enzyme Inhibition and Medicinal Chemistry, 2023
A library of N-benzylpyridinium-based compounds, 7a-j and 8a-j, was designed and synthesised as potential acetylcholinesterase) AChE (inhibitors. An in vitro assay for the synthesised compounds showed that most compounds had significant AChE inhibitory ...
Nafisah M. Al-Rifai, Nemeh M. Al-Khalileh, Jalal A. Zahra, Musa I. El-Barghouthi, Fouad H. Darras   +4 more
doaj   +1 more source

Crystal structure of 4-amino-1-(4-methylbenzyl)pyridinium bromide

Acta Crystallographica Section E, 2014
The title molecular salt, C13H15N2+·Br−, crystallized with two independent ion pairs (A and B) in the asymmetric unit. In the cations, the planes of the pyridine and benzene rings are inclined to one another by 79.32 (8) and 82.30 (10)° in ion pairs A ...
N. Sharmila, T. V. Sundar, A. Yasodha, A. Puratchikody, B. Sridhar   +4 more
doaj   +1 more source

(E)-2,6-Dibromo-4-{2-[1-(1H,1H,2H,2H-perfluorooctyl)pyridinium-4-yl]ethenyl}phenolate methanol disolvate, a fluoroponytailed solvatochromic dye

Acta Crystallographica Section E: Crystallographic Communications, 2017
The title compound, C21H12Br2F13NO·2CH3OH, was obtained by condensation of 4-methyl-1-(1H,1H,2H,2H-perfluorooctyl)pyridinium iodide and 3,5-dibromo-4-hydroxybenzaldehyde, followed by deprotonation.
Lukas Fliri, Gabriel Partl, Thomas Gelbrich, Volker Kahlenberg, Gerhard Laus, Herwig Schottenberger   +5 more
doaj   +1 more source

Theoretical Analysis of the Heterocyclic [4+2] Cycloaddition Between Pyridinium Ion and Enol Ether

ChemistryOpen, 2021
Dearomative heterocyclic [4+2] cycloaddition between the N‐(2,4‐dinitrophenyl)pyridinium ion of nicotinamide and an enol ether was analyzed by Density Functional Theory (DFT) calculations.
Masataka Nakahara, Prof. Kengo Hanaya, Prof. Takeshi Sugai, Prof. Shuhei Higashibayashi   +3 more
doaj   +1 more source

2-Amino-4-methoxy-6-methylpyrimidin-1-ium trifluoroacetate

IUCrData, 2016
In the title molecular salt, C6H10N3O+·C2F3O2−, the pyrimidinium cation is essentially planar, with a maximum deviation of 0.042 (3) Å for all non-H atoms.
Muthaiah Jeevaraj, Bellarmin Edison, Savaridasson Jose Kavitha, Kanagasabapathy Thanikasalam, Sebastian Britto, Kasthuri Balasubramani   +5 more
doaj   +1 more source

Synthesis and Evaluation of Self-Assembling Properties of 3-(3,5-Difluoro-3,5-bis((alkoxy)carbonyl)-2,6-dioxoheptan-4-yl)-1-methylpyridin-1-ium Iodides

Molbank, 2022
A synthesis of 3-(3,5-difluoro-3,5-bis((alkoxy)carbonyl)-2,6-dioxoheptan-4-yl)-1-methylpyridin-1-ium iodides with ethyl or nonyl ester groups at positions 3 and 5 was performed. Treatment of the corresponding 2’,6’-dimethyl-1’,4’-dihydro-[3,4’-bipyridine]
Nadiia Pikun, Davis Lacis, Arkadij Sobolev, Martins Rucins, Mara Plotniece, Karlis Pajuste, Aiva Plotniece   +6 more
doaj   +1 more source

Domain Structure and Birefringence in Pyridinium Perchlorate and Pyridinium Fluoroborate Single Crystal [PDF]

, 2004
Pyridinium perchlorate and pyridinium fluoroborate were grown and their successive phase transitions were studied by means of polarized microscopic observations and measurements of linear birefringence temperature changes.
Czapla, Z., Kosturek, B.
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Pyridinium based amphiphilic hydrogelators as potential antibacterial agents

Beilstein Journal of Organic Chemistry, 2010
The numerous applications of hydrogelators have led to rapid expansion of this field. In the present work we report the facile synthesis of amphiphilic hydrogelators having a quaternary pyridinium unit coupled to a hydrophobic long alkyl chain through an
Sayanti Brahmachari, Sisir Debnath, Sounak Dutta, Prasanta Kumar Das   +3 more
doaj   +1 more source