enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Pyridinium perbromide - Wikipedia

    en.wikipedia.org/wiki/Pyridinium_perbromide

    Pyridinium perbromide (also called pyridinium bromide perbromide, pyridine hydrobromide perbromide, or pyridinium tribromide) is an organic chemical composed of a pyridinium cation and a tribromide anion. It can also be considered as a complex containing pyridinium bromide—the salt of pyridine and hydrogen bromide—with an added bromine (Br ...

  3. Tribromide - Wikipedia

    en.wikipedia.org/wiki/Tribromide

    Tribromide is the anion with the chemical formula Br 3 −, or salts containing it: . Tetrabutylammonium tribromide; Tetrabromophosphonium tribromide; Pyridinium perbromide; Sodium and potassium tribromides can be prepared by reacting NaBr or KBr with aqueous bromine.

  4. Pyridinium - Wikipedia

    en.wikipedia.org/wiki/Pyridinium

    Pyridinium refers to the cation [C 5 H 5 NH] +. It is the conjugate acid of pyridine . Many related cations are known involving substituted pyridines, e.g. picolines, lutidines, collidines.

  5. Pyridinium chloride - Wikipedia

    en.wikipedia.org/wiki/Pyridinium_chloride

    Containing a pyridinium ion, pyridinium chloride has a pK a of approximately 5, slightly more acidic than that of typical amines. This is due to the hybridization of the nitrogen: the nitrogen is sp 2 hybridized and more electronegative than those nitrogens in ammonium cations, which are sp 3 hybridized. Hence they are stronger acids than ...

  6. Category:Pyridinium compounds - Wikipedia

    en.wikipedia.org/wiki/Category:Pyridinium_compounds

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us

  7. Pyridinium p-toluenesulfonate - Wikipedia

    en.wikipedia.org/wiki/Pyridinium_p-toluenesulfonate

    In organic synthesis, PPTS is used as a weakly acidic catalyst, providing an organic soluble source of pyridinium (C 5 H 5 NH +) ions.For example, PPTS is used to deprotect silyl ethers or tetrahydropyranyl ethers when a substrate is unstable to stronger acid catalysts.

  8. Methylpyridinium - Wikipedia

    en.wikipedia.org/wiki/Methylpyridinium

    Methylpyridinium is prepared by treating pyridine with dimethylsulfate: [2]. C 5 H 5 N + (CH 3 O) 2 SO 2 → [C 5 H 5 NCH 3] + CH 3 OSO − 3. It is found in some coffee products. [3] It is not present in unroasted coffee beans, but is formed during roasting from its precursor chemical, trigonelline. [3]

  9. Zincke reaction - Wikipedia

    en.wikipedia.org/wiki/Zincke_reaction

    The first reaction is the formation of the N-2,4-dinitrophenyl-pyridinium salt (2). This salt is typically isolated and purified by recrystallization. The formation of the DNP-pyridinium salt. Upon heating a primary amine with the N-2,4-dinitrophenyl-pyridinium salt (2), the addition