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 1999 · 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
On backorder — expected to ship by 24 November 2026
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
Need a different quantity or pack?
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.
Prices exclude VAT/sales tax and shipping.
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
Safety Data Sheets (SDS)
We haven't published a Safety Data Sheet for this product yet. Ask us and we'll send you one.
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.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
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.