Molekula
4-Bromo-1-butene
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
4-Bromo-1-butene is a brominated alkene used primarily in organic synthesis, pharmaceutical intermediates, and polymer chemistry for its reactive bromine and alkene functional groups. It serves as a key building block in the preparation of specialty chemicals, agrochemicals, and fine chemicals. This product has a CAS number of 5162-44-7, a molecular formula of BrCH2CH2CH=CH2, and a molecular weight of 135.00 g/mol. It must be stored between 2 to 8°C and carries a **Danger** signal word due to its hazardous nature. Molekula supplies 4-Bromo-1-butene from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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5 g — £30.90 per pack ex VAT · £37.08 inc. VAT
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Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
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Specifications
Specifications available on request — see Documents below or contact our sales team.
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Flash Point | 1 °C |
| Transport Class | 3 |
| Packing Group | II |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 90026278 |
| CAS Number | 5162-44-7 |
| IUPAC Name | 4-bromobut-1-ene |
| EC Number | 225-937-4 |
| Molecular Formula | BrCH2CH2CH=CH2 |
| Molecular Weight | 135.00 |
| Exact Mass | 133.9731 |
| SMILES | C=CCCBr |
| InChIKey | DMAYBPBPEUFIHJ-UHFFFAOYSA-N |
| InChI | InChI=1S/C4H7Br/c1-2-3-4-5/h2H,1,3-4H2 |
| PubChem CID | 21241 |
| UN Number | UN1993 |
| REACH Code | Y110 |
| Tariff Code | 29033919 |
Safety & GHS
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Flammable
GHS02
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
Hazard statements
- H225 Highly flammable liquid and vapour
- H317 May cause an allergic skin reaction
- H319 Causes serious eye irritation
- H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled
- H335 May cause respiratory irritation
Precautionary statements
- P210 Keep away from heat/sparks/open flames/hot surfaces - No smoking
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P304+341 IF INHALED: If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 1-Bromo-3-butene
- 1-Butene, 4-bromo-
- 3-Butenyl bromide
- 4-bromo-1-buten
- 4-bromo-l-butene
- 4-Bromobut-1-ene
- 4-bromobuten
- 4-Bromobutene
- ALLYLCARBINYL BROMIDE
- Homoallyl bromide
Frequently asked questions
What is 4-Bromo-1-butene commonly used for?
4-Bromo-1-butene is primarily used as an intermediate in organic synthesis, including the preparation of pharmaceuticals, agrochemicals, and specialty polymers.
What is the molecular formula and molecular weight of 4-Bromo-1-butene?
The molecular formula is **BrCH₂CH₂CH=CH₂**, and the molecular weight is **135.00 g/mol**.
How should 4-Bromo-1-butene be stored?
Store at **2 to 8°C** in a cool, dry place, away from incompatible substances like oxidizing agents and strong bases.
What purity grades are available for 4-Bromo-1-butene?
Molekula supplies 4-Bromo-1-butene in **reagent-grade purity (≥97%)** for research and development applications.
Can Molekula supply 4-Bromo-1-butene in bulk quantities?
Yes, bulk quantities are available upon request—contact our sales team for custom packaging and pricing.
What documentation is provided with an order of 4-Bromo-1-butene?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS)**, and **batch-specific documentation** for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.