Results 11 to 20 of about 9,152 (195)

Nickel‐Catalyzed Synthesis of Dialkyl Ketones from the Coupling of N‐Alkyl Pyridinium Salts with Activated Carboxylic Acids [PDF]

Angewandte Chemie - International Edition, 2020
Mary Watson, Megan Hoerrner, Daniel Weix   +2 more
exaly   +2 more sources

Evidence of Counterion Size Effect on the Stability of Columnar Phase of Ionic Liquid Crystals Based on Pyridinium Salts Derived from N-3,4,5-Tri(alkyloxy)-benzyl-4-pyridones

Crystals, 2022
The synthesis and characterization of novel ionic liquid crystals based on pyridinium salts with Br− and PF6− counterions are described in this work. These pyridinium salts were derived from 4-hydroxypyridine, both by N- and O-alkylation.
Isabela Dumitru, Florentina L. Chiriac, Monica Ilis, Iuliana Pasuk, Doina Manaila-Maximean, Marin Micutz, Teodora Staicu, Viorel Cîrcu   +7 more
doaj   +1 more source

A method for the nucleophilic fluorination of 4-dimethylaminopyridine (DMAP) pyridinium salts

Results in Chemistry, 2023
Fluorinated organic compounds have proven to be beneficial in various industries. Recent research has utilized quaternary ammonium salts as precursors for fluorinations using the radioactive isotope 18F.
Derek Cressy, Murthy Akula, Aaron Frederick, Kaylin Shipley, Dustin Osborne   +4 more
doaj   +1 more source

2-(1-Methoxycarbonyl-2-phenyleth-1-yl)-1-benzylpyridin-1-ium Bromide

Molbank, 2023
In this work, we report the unexpected conversion of a pyridine derivative into the corresponding N-benzylated pyridinium salt due to the presence of unreacted benzyl bromide in the crude product. This transformation was observed at room temperature in a
Lorenzo Suigo, Valentina Straniero, Ermanno Valoti   +2 more
doaj   +1 more source

Novel Coumarin–Pyridine Hybrids as Potent Multi-Target Directed Ligands Aiming at Symptoms of Alzheimer’s Disease

Frontiers in Chemistry, 2022
Graphical AbstractA novel series of 3-phenyl-coumarin derivatives containing pyridinium salts was prepared, indicating significant inhibitory activity against AChE and BuChE as well as precious neuroprotective and anti-Aβ aggregation effects.
Elaheh Babaei, Tuba Tüylü Küçükkılınç, Leili Jalili-Baleh, Hamid Nadri, Esin Öz, Hamid Forootanfar, Elaheh Hosseinzadeh, Tayebeh Akbari, Mehdi Shafiee Ardestani, Loghman Firoozpour, Alireza Foroumadi, Mohammad Sharifzadeh, Bi Bi Fatemeh Mirjalili, Mehdi Khoobi, Mehdi Khoobi   +14 more
doaj   +1 more source

On the photochemical reaction of pyridinium salts with nucleophiles [PDF]

Photochemical & Photobiological Sciences, 2021
AbstractDFT calculations on the photochemical reaction of 1-n–N-butylpyridinium salt in water with hydroxide anion is in agreement with a singlet state process where the S2 state at λ = 253 nm can be converted into a Dewar isomer (2-butyl-2-azabicyclo[2.2.0]hexa-2,5-dien-2-yl cation).
openaire   +4 more sources

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

Preparation of the Pyridinium Salts Differing in the Length of the N-Alkyl Substituent

Molecules, 2010
Quaternary pyridinium salts with chains ranging from C8 to C20 belong in the large group of cationic surfactants. In this paper, the preparation of such cationic surface active agents based on the pyridinium moiety and differing in the length of the N ...
Kamil Musilek, Jan Korabecny, Miroslav Pohanka, Ondrej Soukup, Jiri Cabal, Petr Stodulka, Jan Marek, Kamil Kuca   +7 more
doaj   +1 more source

4,4′,4″-(Benzene-1,3,5-triyltris(ethyne-2,1-diyl))tris(1-methylpyridin-1-ium) Iodide

Molbank, 2023
Despite having been known for a long time, quaternary 4,4′-bipyridinium salts, or viologens, are still a highly inspiring class of compounds, thanks to their peculiar redox and charge transfer properties.
Lorenza Romagnoli, Andrea D’Annibale, Alessandro Latini   +2 more
doaj   +1 more source

Catalytic response and molecular simulation studies in the development of synthetic routes in trimeric triaryl pyridinium type ionic liquids

Scientific Reports, 2023
Under conventional and silica-supported Muffle furnace methods, water-soluble substituted trimeric triaryl pyridinium cations with various inorganic counter anions are synthesized.
Ramalingam Tamilarasan, Annadurai Subramani, G. Sasikumar, Pandurangan Ganapathi, S. Karthikeyan, Sasikumar Ponnusamy, Salim Albukhaty, Mustafa K. A. Mohammed, Zaidon T. Al-aqbi, Faris A. J. Al-Doghachi, Duha S. Ahmed, Yun Hin Taufiq-Yap   +11 more
doaj   +1 more source