Results 171 to 180 of about 23,632 (231)

Tunable bis(pyridinium amidate) ligands efficiently promote palladium-catalyzed ethylene polymerization.

Catal Sci Technol
Reusser E, Albrecht M.
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Isolable Pyridinium Trifluoromethoxide Salt for Nucleophilic Trifluoromethoxylation

Organic Letters, 2021
An isolable pyridinium trifluoromethoxide salt is prepared from the reaction of 4-dimethylaminopyridine with the commercially available liquid 2,4-dinitro(trifluoromethoxy)benzene. The salt is an effective trifluoromethoxide source for SN2 reactions to form trifluoromethyl ethers.
Geraldo Duran-Camacho, Devin M. Ferguson, Jeff W. Kampf, Douglas C. Bland, Melanie S. Sanford   +4 more
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N-(?-ferrocenylalkyl) pyridinium salts

Bulletin of the Academy of Sciences, USSR Division of Chemical Science, 1966
1. N- (α-Ferrocenylalkyl)pyridinium p-toluenesulfonates are formed when ferrocenylcarbinols are reacted with p-toluenesulfonyl chloride in pyridine. 2. The N-(α-ferrocenylalkyl)pyridinium salts are good ferrocenylalkylating agents.
A. N. Nesmeyanov, E. G. Perevalova, M. D. Reshetova   +2 more
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Antimycobacterial Activity of Quaternary Pyridinium Salts and Pyridinium N-oxides - Review

Current Pharmaceutical Design, 2012
The treatment of tuberculosis and other mycobacterioses is still a major world health problem and new antimycobacterial compounds unrelated to approved drugs are in demand. Quaternary ammonium salts have revealed many usable properties especially as antimicrobials; they are widely used as disinfection and antiseptic agents.
Martin, Krátký, Jarmila, Vinšová
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Direct C–H Sulfonylimination of Pyridinium Salts

Organic Letters, 2022
A direct pyridinium C-H sulfonylimination has been developed for the synthesis of sulfonyl iminopyridine derivatives with high efficiency. This transformation features the direct and efficient formation of a C═N bond with a high functional group tolerance under metal-free conditions.
Lihua Luo, Juan Tang, Rui Sun, Wenjing Li, Xueli Zheng, Maoling Yuan, Ruixiang Li, Hua Chen, Haiyan Fu   +8 more
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Recyclization of polysubstituted pyridinium salts

Tetrahedron, 1995
Abstract 3,5-Diacetyl- and 3,5-dicyano-1,2,6-trimethylpvridinium perchlorates are converted by recyclization into N,5-dimethylanilines and 2-methylaminopyridines, respectively.
Galina P. Shkil, Viesturs Lusis, Dzintra Muceniece, Reva S. Sagitullin   +3 more
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Rapid Electrophilic Cysteine Arylation with Pyridinium Salts

Bioconjugate Chemistry, 2022
Here, we present a series of fluorinated cationic reagents that enable rapid arylation of cysteine under mild conditions compatible with proteins and peptides. The highly polarized C-F bond and attractive nucleophile-electrophile Coulombic interactions substantially accelerate cysteine arylation, leading to unusually high rate constants on the order of
Bradley M. Lipka, Vincent M. Betti, Daniel S. Honeycutt, Daniel L. Zelmanovich, Max Adamczyk, Ruojun Wu, Harrison S. Blume, Caitlin A. Mendina, Jacob M. Goldberg, Fang Wang   +9 more
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Hexahydrobenzothiazolo[3,2-a]pyridinium salts

Chemistry of Heterocyclic Compounds, 1988
Salts of hexahydrobenzothiazolo[3,2-a]pyridine are obtained by exchange reactions. Anions are placed in the order [(NC)2CCHC(CN)2]- > ClO4−>I3−>Br− according to the ability to displace each other. X-ray structural and spectroscopic studies establish the cis-attachment of the thiazolidine and cyclohexane rings in the hexahydrobenzothiazolo [3,2-a ...
A. M. Shestopalov, V. N. Nesterov, Yu. A. Sharanin, V. P. Litvinov, V. E. Shklover, Yu. T. Struchkov, V. K. Promonenkov   +6 more
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Catalytic hydrogenation of pyridinium salts

Chemistry of Heterocyclic Compounds, 1994
Catalytic hydrogenation of polysubstituted pyridinium salts leads to piperidines and their condensed analogs The spatial properties and conformational properties of the saturated azaheterocycles have been determined by13C NMR spectorscopy. It was shown that hydrogenation of the pyridinium salts occurs stereoselectively to form cis isomers in most cases.
P. V. Reshetov, S. A. Rozhnova, A. P. Kriven'ko   +2 more
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New electrochromic polymeric pyridinium salts

Polymer Science Series B, 2009
A series of new anode-cathode conjugated electrochromic polymeric pyridinium salts containing mainchain triphenylamine units and demonstrating multicolor electrochromism has been synthesized. All of the polymers exhibit intense UV absorption with maxima of absorption and fluorescence at 340–343 and 336–338 nm in DMF solutions and 460–461 and 410–438 nm
M. L. Keshtov, T. E. Grigor’ev, A. R. Khokhlov   +2 more
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