Results 201 to 210 of about 30,087 (242)

Azulene‐substituted pyridines and pyridinium salts. Synthesis and structure. 2. Azulene‐substituted pyridinium salts

Journal of Heterocyclic Chemistry, 2007
Abstractmagnified image4‐Azulen‐1‐yl substituted 2,6‐dimethyl‐and 2,6‐diphenyl‐pyridinium salts are obtained in yields between 50 % and 100 % in the reaction of corresponding 4‐azulen‐1‐yl‐pyranylim salts and various amines. The effects of amine structure and of substitution in the heterocycle or at azulene moieties on the synthesis have been ...
Alexandru C. Razus, Liviu Birzan, Claudia Pavel, Oana Lehadus, Andreea Corbu, Filip Chiraleu, Cristian Enache   +6 more
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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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Azulene‐Substituted Pyridines and Pyridinium Salts. Synthesis and Structure. Part 2. Azulene‐Substituted Pyridinium Salts.

ChemInform, 2007
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Alexandru C. Razus, Liviu Birzan, Claudia Pavel, Oana Lehadus, Andreea Corbu, Filip Chiraleu, Cristian Enache   +6 more
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Syntheses Using Pyridinium Salts (IV)

Angewandte Chemie International Edition in English, 1963
AbstractCleavage of N‐phenylpyridinium or N‐vinylpyridinium salts with secondary aliphatic amines leads to aromatic amino compounds or enamines which are often unobtainable by other routes. The other fragment, glutacondialdehyde or its monoanil, gives azulenes, as shown by Ziegler and Hafner, as well as König; these compounds can also be prepared from ...
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Pyridines and pyridinium salts from cyanoacetamides

Australian Journal of Chemistry, 1976
Self-condensation of cyanoacetamides under the influence of phosphorus oxychloride leads to pyridines and pyridinium salts in high yield. The mechanism of the reaction is discussed and evidence for the structure of the products is described. The chemical activity of the new pyridine derivatives has been briefly explored.
AL Cossey, RLN Harris, JL Huppatz, JN Phillips   +3 more
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Organized polymerization of vinyl pyridinium salts

Journal of Polymer Science Part C: Polymer Symposia, 1968
AbstractThe study of the spontaneous polymerization of quaternary vinyl pyridinium salts in concentrated aqueous solutions showed that the process occurred by the specific ionic mechanism. The results of kinetic measurements made for 1,2‐dimethyl‐5‐vinylpyridinium methyl sulfate are interpreted in terms of chain propagation in aggregates of regular ...
V. A. Kabanov, T. I. Patrikeeva, O. V. Kargina, V. A. Kargin   +3 more
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Synthesis of meso-pyridinium porphyrin salts

Tetrahedron Letters, 1976
Zinkoctaathylporphyrin (I) liefert bei Behandlung mit Thallium(III)-nitrat und anschliesend mit Pyridinen in meso- Stellung substituierte Pyridiniumsalze (II).
Graham H. Barnett, Brian Evans, Kevin M. Smith, S. Besecke, J.-H. Fuhrhop   +4 more
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Dehalogenation via pyridinium salts

The Journal of Organic Chemistry, 1974
Tse-Lok Ho, Chiu Ming Wong
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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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N-Substitutes Pyridinium Salts

HETEROCYCLES, 1989
Wanda Sliwa, Barbara Mianowska
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