Results 221 to 230 of about 64,953 (273)

Synthesis and studies on pyridinium pentafluorozirconate and pyridinium oxotetrafluoroniobate

Journal of Fluorine Chemistry, 1994
Abstract Pyridinium pentafluorozirconate, (C5H5NH)ZrF5, and pyridinium oxotetrafluoroniobate, (C5H5NH)NbOF4, have been synthesised by the reaction of pyridinium poly(hydrogen fluoride), PPHF, with ZrOCl2 and Nb2O5, respectively. These new complexes have been characterised by chemical analysis, thermal analysis, X-ray diffraction and infrared spectra.
Singh, Ram Niwas, Padma, DK
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2-(Hydroxymethyl)pyridinium dihydrogenphosphate

Acta Crystallographica Section C Crystal Structure Communications, 2003
The title compound, C(6)H(8)NO(+).H(2)PO(4)(-), consists of 2-(hydroxymethyl)pyridinium and dihydrogenphosphate ions. The dihydrogenphosphate moieties are linked into chains by pairs of P-O-H.O-P hydrogen bonds. The 2-(hydroxymethyl)pyridinium cations are connected to the dihydrogenphosphate units by O-H.O and N-H.O hydrogen bonds.
Demir, S, Yılmaz, Veysel T., Harrison, WTA   +2 more
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Pyridinium Ylids in Heterocyclic Synthesis

Current Organic Chemistry, 2011
Pyridinium ylids are versatile tools in organic synthesis. The stability of pyridinium ylids and their generation is commented. This review gives an overview of the possible modes through which pyridinium ylids can react.
Sven Claessens, Eva van Hende, Norbert de Kimpe   +2 more
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Pyridinium dihydrogenmonothiophosphate

Acta Crystallographica Section C Crystal Structure Communications, 2000
By reaction of pyridine dithiomonometaphosphoryl fluoride with ethyldiphenylphosphine in the presence of traces of water, we isolated crystals of the title compound, (I). In the structure of this salt, two kinds of hydrogen bonds were detected. They link N-H (part of the cation), as well as one O-H group (part of the anion), to the phosphoryl O atom of
B, Ziemer, A, Rabis
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1H NMR Evidence for the Bi-Pyridinium Nature of the Pyridine Salt of H3PW12O40

Catalysis Communications, 2005
Pyridinium salts of H3PW12O40 and H3PMo12O40 were investigated by 1H NMR and IR spectroscopies. 1H NMR evidenced the formation of bi-pyridinium cation in the pyridinium salt of H3PW12O40, while a classical pyridinium cation was identified in the ...
Chantal Lorentz, Nadine Essayem
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Synthesis of pyridinium heterocyclic ylides. Degradation of the pyridinium group

Journal of Heterocyclic Chemistry, 1981
AbstractThe synthesis of pyridinium‐quinolone chlorides and ylides, a pyridinium‐methylquinazolone ylide, 9‐pyridinium acridine chloride, and their behaviour by treatment with boiling aniline are described.
Marta E. Esteve, Carlos H. Gaozza
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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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Reactivity of Halo(pyridinium)carbenes

The Journal of Organic Chemistry, 2009
The reactivity of chloro- and fluoro(N-methyl-3-pyridinium)carbenes was examined by laser flash photolysis, where the halo(pyridinium)carbenes formed ylides with pyridine, acetonitrile, and acetone. Although the halo(pyridinium)carbenes reacted within the time of the laser pulse, their relative reactivities with a series of alkenes could be obtained ...
Reinaldo, Moya-Barrios, Benjamin M, Fregeau, Frances L, Cozens   +2 more
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The crystal structure of pyridinium dichloroiodide

Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 1973
Pyridinium dichloroiodide, CsNH6ICI2, is trigonal, space group R3m, with a=6.165 (4)A, e= 82.45 (6) °, D,,=2.06 g cm -a (by flotation), Z=I, Dc=2"04 g cm -3. The atomic positions have been determined by least-squares refinement of counterintensities, the final R being 0.023 for 227 reflexions.
Tucker, P. A., Kroon, P. A.
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The nature of the reduction product in pyridinium chlorochromate and pyridinium dichromate oxidations

Inorganica Chimica Acta, 1984
Les produits de reduction et d'oxydation du titre sont des composes stœchiometriques respectivement de Cr(IV) et de Cr(V)
Damburu M. Patro, Radhasyam Panda, Akhil K. Panigrahy, Surendra N. Mahapatro   +3 more
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