Results 161 to 170 of about 14,921 (209)

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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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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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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Thiazolo [3,2‐a] pyridinium salts

Journal of Heterocyclic Chemistry, 1966
AbstractThe sulfides formed by the reaction of α‐halo ketones or α‐halo acetals with 2‐mercaptopyridine may be cyclized in good yield to form thiazolo[3, 2‐a]pyridinium salts. The presence of chloro or nitro substituents on the pyridine ring does not interfere with the synthesis.
C. K. Bradsher, D. F. Lohr
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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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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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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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Synthesis and characterizations of pyridinium salts including poly(pyridinium salt)s and their applications

2012
Pyridinium salts, both molecular and polymeric, are an interesting class of multifunctional materials that exhibit liquid-crystalline and light-emitting properties. Moreover, their properties can be easily tuned by introducing new types of anions or by modifying their chemical structures.
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VIBRATIONAL SPECTRA OF PYRIDINIUM SALTS

Canadian Journal of Chemistry, 1961
The vibrational spectrum of the pyridinium ion, C5H5NH+, and the N-deuterated species has been studied in several pyridinium salts. By comparison with benzene and deuterobenzene (with which the pyridinium ion is isoelectronic) a fairly complete assignment has been made. The N—H bonds, which are hydrogen bonded to the anions, have stretching vibrations
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Oxidation of polysubstituted pyridinium salts

Collection of Czechoslovak Chemical Communications, 1982
Oxidation of 1-substituted 2,4,6-triphenylpyridinium salts Ia-Ij with potassium ferricyanide in an alkaline medium was accompanied by contraction of the pyridine ring and formation of 1,2,3,5-tetrasubstituted pyrroles II. The derivative IIf underwent facile electrophilic substitution in the position 4. Contrary to compounds Ia-Ij, the 1-substituted-2,6-
Petr Nesvadba, Josef Kuthan
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