Results 11 to 20 of about 23,632 (231)

Catalytic photochemical enantioselective α-alkylation with pyridinium salts. [PDF]

Chem Sci, 2023
We have developed a chiral amine catalyzed enantioselective α-alkylation of aldehydes with amino acid derived pyridinium salts as alkylating reagents. The reaction proceeds in the presence of visible light (390 nm) and in the absence of a photocatalyst via a light activated charge-transfer complex.
Yetra SR, Schmitt N, Tambar UK.
europepmc   +3 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

Asymmetric addition of chiral boron-ate complexes to cyclic iminium ions [PDF]

, 2014
Boron-ate complexes derived from enantioenriched secondary benzylic boronic esters and aryl lithiums have been reacted with quinolinium, pyridinium and dihydroisoquinolinium salts to give enantioenriched heterocyclic structures with very high ...
Aggarwal, Varinder K., Feeney, Katie M J, Leonori, Daniele, Mohiti, Maziar, Rampalakos, Konstantinos   +4 more
core   +2 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

Computer-Assisted Design of Environmentally Friendly and Light-Stable Fluorescent Dyes for Textile Applications. [PDF]

, 2019
Five potentially environmentally friendly and light-stable hemicyanine dyes were designed based on integrated consideration of photo, environmental, and computational chemistry as well as textile applications.
Chen, Guoqiang, Sun, Gang, Tang, Songsong   +2 more
core   +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

Designed Azolopyridinium Salts Block Protective Antigen Pores In Vitro and Protect Cells from Anthrax Toxin [PDF]

, 2013
Background:Several intracellular acting bacterial protein toxins of the AB-type, which are known to enter cells by endocytosis, are shown to produce channels.
A Kronhardt, A Messmer, A Ménard, A Ménard, AA Verveen, AF Kintzer, AM Friedlander, Anika Bronnhuber, AW Artenstein, BA Krantz, C Andersen, C Bachmeyer, C Bachmeyer, C Petosa, Christoph Beitzinger, CT Bahner, D Blöcker, D Blöcker, DB Lacy, EM Nestorovich, EM Nestorovich, F Conti, F Orlik, F Orlik, F Tonello, F Tonello, F Wohnsland, G Hajós, G Timári, G Vitale, György Hajós, H Barth, H Barth, Holger Barth, I Zornetta, J Sun, J Wesche, JA Young, JC Milne, JL Elliott, K Cunningham, KA Bradley, Kerstin Duscha, L Abrami, L Abrami, L Abrami, L Abrami, L Song, Ludger Johannes, M Eigen, M Mock, Markus Huber-Lang, MJ Brown, NS Duesbery, PC Hanna, R Benz, R Benz, R Palkó, R Pellizzari, RJ Collier, RO Blaustein, RO Blaustein, Roland Benz, S Nekolla, SH Leppla, SM Bezrukov, SM Bezrukov, T Neumeyer, T Neumeyer, T Neumeyer, TC Dixon, V Escuyer, VA Karginov, VA Karginov, VA Karginov, Y Singh, Zsuzsanna Riedl   +76 more
core   +2 more sources