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HomeProduct name listPyridinium tribromide

Pyridinium tribromide

Synonym(s):Pyridinium bromide perbromide;Pyridine hydrobromide perbromide;Pyridine hydrobromide perbromide polymer-bound;Pyridine perbromide hydrobromide;Poly(4-vinylpyridine hydrobromide perbromide)

  • CAS NO.:39416-48-3
  • Empirical Formula: C5H6Br3N-2
  • Molecular Weight: 319.82
  • MDL number: MFCD00013223
  • EINECS: 254-446-8
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-08-08 18:06:34
Pyridinium tribromide Structural

What is Pyridinium tribromide?

Chemical properties

red crystals

The Uses of Pyridinium tribromide

Pyridinium Tribromide is a reagent used in the α-thiocyanation of ketones and has also been applied to the synthesis of β-adrenergic blocking agents (also known as β-blockers) for patients with heart failure.

The Uses of Pyridinium tribromide

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

The Uses of Pyridinium tribromide

Pyridine hydrobromide perbromide is used as a brominating reagent in alfa-bromination and alfa-thiocyanation of ketones, phenols, unsaturated and aromatic ethers. It is used as a raw material in the preparation of beta-adrenergic blocking agents. Furthermore, it is used as an analytical reagent.

Purification Methods

It is a very good brominating agent-liberating one mol of Br2. Purify it by recrystallisation from glacial acetic acid (33g from 100mL of AcOH) to give orange-red crystals. [Fieser & Fieser Reagents for Organic Chemistry 1 967 1967, Englert & McElvain J Am Chem Soc 51 865 1929, Beilstein 20 II 103, 20/5 V 181.]

Properties of Pyridinium tribromide

Melting point: 127-133 °C
Density  2.9569 (rough estimate)
refractive index  1.6800 (estimate)
storage temp.  Store at <= 20°C.
solubility  soluble in Methanol
form  Powder, Crystals and/or Chunks
color  Red-orange to red to brown
Water Solubility  decomposes
Sensitive  Lachrymatory
Merck  14,7973
BRN  3690144
Stability: Stable. Incompatible with strong oxidizing agents, strong bases.
CAS DataBase Reference 39416-48-3(CAS DataBase Reference)
EPA Substance Registry System Pyridinium hydrogen tribromide (39416-48-3)

Safety information for Pyridinium tribromide

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H315:Skin corrosion/irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P264:Wash hands thoroughly after handling.
P264:Wash skin thouroughly after handling.
P271:Use only outdoors or in a well-ventilated area.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P302+P352:IF ON SKIN: wash with plenty of soap and water.

Computed Descriptors for Pyridinium tribromide

InChIKey YPCPFIMBGJOEKU-UHFFFAOYSA-O

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