3-Ethynylthiophene
Also known as: 3-Thienylacetylene, 3-Thiopheneacetylene, (Thien-3-yl)acetylene, (thiophen-3-yl)acetylene, Thiophene, 3-ethynyl-, Thiophene, 3-ethynyl- (9CI)
3-Ethynylthiophene (CAS 67237-53-0) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C6H4S and a molecular weight of 108.161 g/mol. Key properties include a boiling point of 150.0±13.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 28.4±6.0 °C. It is classified under GHS with signal word Danger and hazard statements H226 — Flammable liquid and vapour, H315 — Causes skin irritation and H318 — Causes serious eye damage. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 67237-53-0
- Jingsj CID
- J-32233-8
- Molecular Formula
- C6H4S
- Molecular Weight
- 108.161 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 150.0±13.0 °C at 760 mmHg |
|---|---|
| Density | 1.1±0.1 g/cm3 |
| Flash Point | 28.4±6.0 °C |
| Exact Mass | 108.003372 |
| PSA | 28.24000 |
| LogP | 1.88 |
| Appearance | Liquid | Colorless to yellow to orange |
| Vapor Pressure | 5.0±0.3 mmHg at 25°C |
| Refractive Index | 1.571 |
| Additional Property | Slightly soluble in water. |
GHS Safety & Compliance
- H226 — Flammable liquid and vapour
- H315 — Causes skin irritation
- H318 — Causes serious eye damage
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2934999090 |
|---|---|
| Summary | 2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of 3-Ethynylthiophene?
The CAS number of 3-Ethynylthiophene is 67237-53-0.
What are the molecular formula and molecular weight of 3-Ethynylthiophene?
3-Ethynylthiophene has molecular formula C6H4S and molecular weight 108.161 g/mol.
Is 3-Ethynylthiophene hazardous?
3-Ethynylthiophene has GHS signal word Danger and hazard statements H226 — Flammable liquid and vapour; H315 — Causes skin irritation; H318 — Causes serious eye damage.
What are the upstream and downstream products of 3-Ethynylthiophene?
For 3-Ethynylthiophene, Upstream Products: 3-(Trimethylsilylethynyl)thiophene, 3-Thiophenecarboxaldehyde, 3-Thiophenecarbonyl chloride; Downstream Products: Benzamide, 4-Methoxybenzamide, Thiophene-3-carboxylic acid.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "3-Ethynylthiophene (CAS 67237-53-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-32233-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.