2-Ethynylthiophene
Also known as: 2-ETHYNYLTHIOPHENE, (2-Thienyl)acetylene, (Thien-2-yl)acetylene, 2-Acetylenylthiophene, ethynylthiophene, thienylacetylene, Thiophene, 2-ethynyl-, Thiophene, 2-ethynyl- (6CI, 7CI, 8CI, 9CI)
2-Ethynylthiophene (CAS 4298-52-6) 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 Warning and hazard statements H302 — Harmful if swallowed and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 4298-52-6
- Jingsj CID
- J-1072087-3
- 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 | 2.08 |
| Vapor Pressure | 5.0±0.3 mmHg at 25°C |
| Refractive Index | 1.571 |
| Storage Conditions | Store Cold |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H319 — Causes serious eye 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 2-Ethynylthiophene?
The CAS number of 2-Ethynylthiophene is 4298-52-6.
What are the molecular formula and molecular weight of 2-Ethynylthiophene?
2-Ethynylthiophene has molecular formula C6H4S and molecular weight 108.161 g/mol.
Is 2-Ethynylthiophene hazardous?
2-Ethynylthiophene has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H319 — Causes serious eye irritation.
What are the upstream and downstream products of 2-Ethynylthiophene?
For 2-Ethynylthiophene, Upstream Products: 2-[(Trimethylsilyl)ethynyl]thiophene, 2-Iodothiophene, Ethynylmagnesium bromide; Downstream Products: 1,3-Di-2-thienyl-2-propen-1-one, 2-Thiopheneacetic acid, 2-Vinylthiophene.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2-Ethynylthiophene (CAS 4298-52-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1072087-3 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.