4-Bromo-1-butyne
Synonym(s):1-Bromo-3-butyne
- CAS NO.：38771-21-0
- Empirical Formula: C4H5Br
- Molecular Weight: 132.99
- MDL number: MFCD10000883
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-09-12 18:53:35
What is 4-Bromo-1-butyne?
Chemical properties
Yellow liquid
The Uses of 4-Bromo-1-butyne
4-Bromo-1-butyne is used for pharmaceutical intermediates.
The Uses of 4-Bromo-1-butyne
4-Bromo-1-butyne is used as a reactant in the synthesis of:
- Macrocycles by cobalt-mediated [2+2+2] co-cyclotrimerization.
- 2,4,5-trisubstituted oxazoles by a gold-catalyzed formal [3+2] cycloaddition.
- Intramolecular 1,3-dipolar cycloaddition to synthesize 1,3,4-oxadiazoles.
- Lactones bearing alkynes for reductive cyclization in the preparation of azulene derivatives.
- Substituted α-pyrones by gold-catalyzed coupling reactions.
Properties of 4-Bromo-1-butyne
| Boiling point: | 110 °C |
| Density | 1.417 g/mL at 25 °C |
| refractive index | 1.481 |
| Flash point: | 24 °C |
| storage temp. | Inert atmosphere,Store in freezer, under -20°C |
| solubility | Chloroform (Slightly), Methanol (Slightly) |
| form | clear liquid |
| color | Colorless to Light yellow to Light orange |
| Water Solubility | Immiscible with water. |
Safety information for 4-Bromo-1-butyne
| Signal word | Danger |
| Pictogram(s) |
 Flame Flammables GHS02  Skull and Crossbones Acute Toxicity GHS06 |
| GHS Hazard Statements |
H226:Flammable liquids H301:Acute toxicity,oral H317:Sensitisation, Skin |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. 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 4-Bromo-1-butyne
| InChIKey | XLYOGWXIKVUXCL-UHFFFAOYSA-N |
4-Bromo-1-butyne manufacturer
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