Molekula
4-Octyne
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-Octyne is an alkynyl hydrocarbon with a triple bond at the fourth carbon, widely used as a building block in organic synthesis, pharmaceutical intermediates, and materials science for polymer cross-linking. This clear, volatile liquid has a characteristic hydrocarbon odor and serves as a precursor in click chemistry, agrochemicals, and specialty chemical formulations. CAS 1942-45-6 | Molecular formula C8H14 | Molecular weight 110.20 g/mol | Storage at ambient temperature | Signal word: Danger (flammable liquid, aspiration hazard, skin, eye and respiratory irritant). Molekula supplies 4-Octyne 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 26 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 — £29.50 per pack ex VAT · £35.40 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
| Property | Value |
|---|---|
| Appearance | Colourless to pale yellow liquid |
| Identification | Conforms to reference |
| Gas Liquid Chromatography | ≥98% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 29 °C |
| Transport Class | 3 |
| Packing Group | III |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 21082647 |
| CAS Number | 1942-45-6 |
| IUPAC Name | oct-4-yne |
| EC Number | 217-730-2 |
| Molecular Formula | C8H14 |
| Molecular Weight | 110.20 |
| Exact Mass | 110.1096 |
| SMILES | CCCC#CCCC |
| InChIKey | GZTNBKQTTZSQNS-UHFFFAOYSA-N |
| InChI | InChI=1S/C8H14/c1-3-5-7-8-6-4-2/h3-6H2,1-2H3 |
| PubChem CID | 16029 |
| UN Number | UN3295 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2901291050 |
| Tariff Code | 2901290000 |
Safety & GHS
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Flammable
GHS02
-
Health Hazard
GHS07
-
Serious Health Hazard
GHS08
Hazard statements
- H226 Flammable liquid and vapour
- H304 May be fatal if swallowed and enters airways
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P210 Keep away from heat/sparks/open flames/hot surfaces - No smoking
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P284 Wear respiratory protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- 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)
Available in English, English (US), French, German, Italian, Portuguese, Spanish.
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
- 1,2-Dipropylacetylene
- 3-dithylacetylene
- Dipropylacetylene
- GZTNBKQTTZSQNS-UHFFFAOYSA-N
- n-C3H7C.$.CC3H7
- Oct-4-yne
Frequently asked questions
What is 4-Octyne commonly used for?
4-Octyne is primarily used as a building block in organic synthesis, particularly for the preparation of acetylenic compounds, pharmaceutical intermediates, and specialty polymers.
What is the chemical formula and molecular weight of 4-Octyne?
The chemical formula is C₈H₁₄, and the molecular weight is 110.20 g/mol.
How should 4-Octyne be stored?
Store at ambient temperature in a cool, dry, well-ventilated area, away from ignition sources and incompatible materials.
What grades of 4-Octyne does Molekula offer?
Molekula supplies technical grade 4-Octyne; custom specifications may be available upon request.
Can Molekula supply 4-Octyne in bulk quantities?
Yes, we offer bulk packaging options for 4-Octyne—contact our sales team for specific quantities and logistics details.
What documentation comes with an order of 4-Octyne?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and a packing list; additional documentation like a Certificate of Origin may be provided upon request.
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.