Results 11 to 20 of about 60,247 (222)

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 ...
Ondrej Soukup, Jan Korábečný, Miroslav Pohanka   +2 more
exaly   +3 more sources

Pyridinium and related azinium salts in organic synthesis and medicinal chemistry [PDF]

RSC Advances
Pyridinium salts represent a versatile and synthetically valuable class of nitrogen-containing heterocyclic compounds that continue to play a crucial role in modern organic synthesis.
Elham Mohammadi Mehr, Seyed Mohammadreza Alavi, Mosayeb Akbari, Rozita Yazzaf, Soodabeh Davaran, Saghi Sepehri, Mohammad Mahdavi   +6 more
doaj   +2 more sources

Regioselective Oxidation of 3-Substituted Pyridinium Salts

Molecules, 2000
(1'R)-(+)-3-Hydroxymethyl-1-(1'-phenyl-ethyl)-pyridinium chloride (1), 1-benzyl-3-[1', 3']-dioxolan-2'-yl-pyridinium chloride (2) and (2'S, 4'S, 5'R)-(-)-1-benzyl-3-(3',4'-dimethyl-5'-phenyl-oxazolidin-2'-yl)-pyridinium bromide (3), were transformed by ...
W. F. Reynolds, Manuel Soriano, Raúl G. Enríquez, Jorge R. Juárez, Alberto Galindo, Dino Gnecco, Joel L. Terán   +6 more
doaj   +2 more sources

4-(Dimethylamino)pyridinium 4-toluenesulfonate

Acta Crystallographica Section E, 2008
In the title compound, C7H11N2+·C7H7O3S−, the cation is protonated at the N atom of the heterocyclic ring. The dimethylamino group lies close to the pyridinium ring plane with a dihedral angle between the pyridinium and the dimethylamine CNC ...
Jim Simpson, C. John McAdam
doaj   +2 more sources

Catalytic Photochemical Enantioselective α-Alkylation with Pyridinium Salts [PDF]

, 2022
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 ...
Santhivardhana Reddy, Yetra, Nathan, Schmitt, Uttam, Tambar   +2 more
core   +1 more source

PYRIDINIUM, PIPERIDINIUM AND MORPHOLINIUM CATIONIC SURFACTANTS(1): SYNTHESIS, CHARACTERIZATION, HEMOLYSIS AND ANTIOXIDATIVE EFFICIENCY [PDF]

Al-Azhar Journal of Pharmaceutical Sciences, 2013
A Series of pyridinium, piperidinium and morpholinium derived cationic surfactants differing in the length of side alkylating chain from C10 to C18 is described.
Nihal Shaker
doaj   +1 more source

Pyridinium Salts of Dehydrated Lanthanide Polychlorides

Molecules, 2022
The reaction of lanthanide (Ln) chloride hydrates ([Ln(H2O)n(Cl)3]) with pyridine (py) yielded a set of dehydrated pyridinium (py-H) Ln-polychloride salts. These species were crystallographically characterized as [[py-H-py][py-H]2[LnCl6]] (Ln-6; Ln = La,
Roger E. Cramer, Esteban M. Baca, Timothy J. Boyle   +2 more
doaj   +1 more source

A Comparison of the Photophysical, Electrochemical and Cytotoxic Properties of meso-(2-, 3- and 4-Pyridyl)-BODIPYs and Their Derivatives

Sensors, 2022
Boron dipyrromethene (BODIPY) dyes bearing a pyridyl moiety have been used as metal ion sensors, pH sensors, fluorescence probes, and as sensitizers for phototherapy.
Caroline Ndung’u, Daniel J. LaMaster, Simran Dhingra, Nathan H. Mitchell, Petia Bobadova-Parvanova, Frank R. Fronczek, Noémie Elgrishi, Maria da Graça H. Vicente   +7 more
doaj   +1 more source

1,1′-(Ethane-1,2-diyl)bis(4-{(E)-2-[4-(dimethylamino)phenyl]ethenyl}pyridin-1-ium) dibromide ethanol 0.67-solvate

IUCrData, 2021
The asymmetric unit of the title solvated molecular salt, 3C32H36Br2N42+·6Br−·2C2H5OH, consists of 1.5 cations, three bromide anions and one ethanol solvent molecule of crystallization. The half-cation is completed by crystallographic inversion symmetry.
Shengnan Wang, Gang Liu, Zhichao Wu
doaj   +1 more source

Synthesis, Characterization, Biological Evaluation, and In Silico Studies of Imidazolium-, Pyridinium-, and Ammonium-Based Ionic Liquids Containing n-Butyl Side Chains

Molecules, 2022
Ionic liquids (ILs) have emerged as active pharmaceutical ingredients because of their excellent antibacterial and biological activities. Herein, we used the green-chemistry-synthesis procedure, also known as the metathesis method, to develop three ...
Rabia Hassan, Farzana Nazir, Mah Roosh, Arshemah Qaisar, Uzma Habib, Abdulrahim A. Sajini, Mudassir Iqbal   +6 more
doaj   +1 more source