Search results
Results from the WOW.Com Content Network
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 ...
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.
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.
Chemical formula. C 12 H 13 N O 3 S: Molar mass: 251.30 g·mol −1 Appearance Colourless solid Melting point: ... Pyridinium p-toluenesulfonate (PPTS) ...
Pyridinium chlorochromate in a vial. Pyridinium chlorochromate (PCC) is a yellow-orange salt with the formula [C 5 H 5 NH] + [CrO 3 Cl] −. It is a reagent in organic synthesis used primarily for oxidation of alcohols to form carbonyls. A variety of related compounds are known with similar reactivity.
Chemical formula. C 9 H 15 Br N 2 O 2: Molar mass: 263.135 ... Selective α-bromination of the acetyl group with pyridinium tribromide gives a bromoketone whose ...
This lone pair does not overlap with the aromatic π-system ring, consequently pyridine is basic, having chemical properties similar to those of tertiary amines. Protonation gives pyridinium, C 5 H 5 NH +.The pK a of the conjugate acid (the pyridinium cation) is 5.25. The structures of pyridine and pyridinium are almost identical. [87]
The molecular formula of cetylpyridinium chloride is C 21 H 38 NCl. In its pure form it is a solid at room temperature. It has a melting point of 77 °C when anhydrous or 80–83 °C as a monohydrate. It is soluble in water but insoluble in acetone, acetic acid, or ethanol. It has a pyridine-like odor. It is combustible.