7973. Pyridinium Bromide Perbromide

Nomenclature

CAS number: 39416-48-3
Hydrogen tribromide compd with pyridine (1:1).
C5H6Br3N; mol wt 319.82.
C 18.78%, H 1.89%, Br 74.95%, N 4.38%.
C5H5N+HBr3-.

Description and references

Prepd from pyridine, hydrobromic acid, and bromine: L. F. Fieser, M. Fieser, Reagents for Organic Chemistry vol. 1 (John Wiley, New York, 1967) p 967.

Properties

Orange-needles from acetic acid. Odorless. Nonvolatile. Sparingly sol in acetic acid. Dissociates in the presence of a bromine acceptor, such as an alkene, to liberate one mole of bromine.

Use

In small-scale brominations, where it is much more convenient and agreeable to measure and use than elemental bromine.