thiophene-2,5-dicarboxylic acid
Also known as: 2,5-dicarboxythiophene, 2,5-thiophenedicarboxylic acid, thiophene-2,5-dicarboxyl acid, 5-carboxythiophene-2-carboxylic acid, 2,5-thiophene dicarboxylic acid
thiophene-2,5-dicarboxylic acid (CAS 4282-31-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C6H4O4S and a molecular weight of 172.159 g/mol. Key properties include a melting point of >300 °C(lit.), a boiling point of 444.6±30.0 °C at 760 mmHg, a density of 1.7±0.1 g/cm3 and a flash point of 222.7±24.6 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Nov 3, 2026.
- CAS No.
- 4282-31-9
- Jingsj CID
- J-2637-8
- Molecular Formula
- C6H4O4S
- Molecular Weight
- 172.159 g/mol
- Category
- Pharma Intermediates
- Last updated
- 11/3/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | >300 °C(lit.) |
|---|---|
| Boiling Point | 444.6±30.0 °C at 760 mmHg |
| Density | 1.7±0.1 g/cm3 |
| Flash Point | 222.7±24.6 °C |
| Exact Mass | 171.983032 |
| PSA | 102.84000 |
| LogP | 1.34 |
| Vapor Pressure | 0.0±1.1 mmHg at 25°C |
| Refractive Index | 1.663 |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- 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 thiophene-2,5-dicarboxylic acid?
The CAS number of thiophene-2,5-dicarboxylic acid is 4282-31-9.
What are the molecular formula and molecular weight of thiophene-2,5-dicarboxylic acid?
thiophene-2,5-dicarboxylic acid has molecular formula C6H4O4S and molecular weight 172.159 g/mol.
Is thiophene-2,5-dicarboxylic acid hazardous?
thiophene-2,5-dicarboxylic acid has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.
What are the upstream and downstream products of thiophene-2,5-dicarboxylic acid?
For thiophene-2,5-dicarboxylic acid, Upstream Products: 2,5-Diiodothiophene, 2,5-Dibromothiophene, Methanol; Downstream Products: 5-(Methoxycarbonyl)thiophene-2-carboxylic acid, 2-(Trifluoromethyl)thiophene, Fluorescent Brightener 185.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "thiophene-2,5-dicarboxylic acid (CAS 4282-31-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-2637-8 (accessed 2026-11-07).
Data for reference only; verify product details with suppliers before purchase.