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: 2026-04-24 14:58:42
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) |
 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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