Results 141 to 150 of about 9,152 (195)

Thiazolopyridinium salts. Part II. Approaches to thiazolo[3,4-a]-pyridinium salts and isothiazolo[2,3-a]pyridinium salts

Journal of the Chemical Society C: Organic, 1969
Attempts to synthesise thiazolo[3,4-a]pyridinium salts (3) and isothiazolo[2,3-a]pyridinium salts (2) by dehydration with boiling acetic anhydride of the 5,6,7,8-tetrahydro-8-oxothiazolo[3,4-a]pyridinium salts (11) and (12) and of the 4,5,6,7-tetrahydro-4-oxoisothiazolo[2,3-a]pyridinium salt (6) respectively are reported. The reasons for the failure of
D. G. Jones, Gurnos Jones
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Pyridinium salts

Chemistry of Heterocyclic Compounds, 1974
P. P. Zarin', �. S. Lavrinovich, A. K. Aren   +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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Imidazo [1,2‐a] pyridinium salts

Journal of Heterocyclic Chemistry, 1965
Abstract2‐Alkylamino‐ or arylaminopyridines react directly with α‐bromoketones to afford 1‐alkyl‐ or 1‐arylimidazo[1,2‐a]pyridinium salts with substituents at position 2. Use of chloroacetaldoxime as the quaternizing agent yields (after hydrolysis) the imidazo‐[1,2‐a]pyridinium ion with no substituent at position 2.
C. K. Bradsher, E. F. Litzinger, M. F. Zinn   +2 more
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Dimerization of pyridinium salts by cyanide

Journal of the Chemical Society D: Chemical Communications, 1970
1,1′-Dihydro-4,4′-bipyridyls (II) are formed from certain pyridinium or 2-methylpyridinium salts and sodium cyanide.
Lawrence J. Winters, Nelson G. Smith, Martin I. Cohen   +2 more
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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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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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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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Pyridinium Salts as Organophosphate Antagonists

2015
By a standard screening in vivo, a series of pyridinium salts were tested for their protective activity against organophosphate poisoning. In order to obtain information about the protective mechanisms, several biochemical properties of these compounds were investigated in vitro, viz., their influence upon the enzymes cholineacetyltransferase and ...
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The reaction of N-nitrosamines with pyridinium salts

Talanta, 1988
N-Nitrosamines react readily with pyridinium salts containing an activated methylene group to give hydrazones. This reaction may serve as the basis for the routine determination of N-nitrosamines.
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