Results 31 to 40 of about 37,029 (225)

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

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

(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

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

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

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

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

Bright NIR-Emitting Styryl Pyridinium Dyes with Large Stokes’ Shift for Sensing Applications

Biosensors, 2023
Two NIR-emitting donor-π-acceptor (D-π-A) type regioisomeric styryl pyridinium dyes (1a–1b) were synthesized and studied for their photophysical performance and environment sensitivity. The two regioisomers, 1a and 1b, exhibited interesting photophysical
Nirasha I. Wickramasinghe, Brian Corbin, Devni Y. Kanakarathna, Yi Pang, Chathura S. Abeywickrama, Kaveesha J. Wijesinghe   +5 more
doaj   +1 more source

Investigation of the Pyridinium Ylide—Alkyne Cycloaddition as a Fluorogenic Coupling Reaction

Molecules, 2016
The cycloaddition of pyridinium ylides with alkynes was investigated under mild conditions. A series of 13 pyridinium salts was prepared by alkylation of 4-substituted pyridines.
Simon Bonte, Ioana Otilia Ghinea, Rodica Dinica, Isabelle Baussanne, Martine Demeunynck   +4 more
doaj   +1 more source

Sulfur‐Free Ultrahigh‐Refractive‐Index Polymers Enabled by Densely Packed Oxygen‐Bridged Dibenzofuran‐Cardo Architectures

Advanced Functional Materials, EarlyView.
A new class of sulfur‐free, oxygen‐bridged dibenzofuran‐based polymers is developed for ultrahigh‐refractive‐index applications. The rigid π‐extended architecture and enhanced molecular polarizability enable exceptional optical performance, combining refractive indices up to 1.848 with high Abbe numbers and full visible transparency. This work offers a
Hend A. Hegazy, Gyeongsoo Kim, Sooyoung Lee, Mohamed R. Elmasry, Youn‐Chul Kim, Changsik Song   +5 more
wiley   +1 more source