![Molecular structure of 3-chlorobenzo[b]thiophene-2-carboxylic acid (CAS 21211-22-3)](/images/chem_structures_svg/204/21211-22-3.svg)
3-chlorobenzo[b]thiophene-2-carboxylic acid
Also known as: 3-chloro-1-benzothiophene-2-carboxylic acid, 3-chloro-2-benzo[b]thiophene carboxylic acid, 3-chlorobenzo(b)thiophene-2-carboxylic acid, 3-chlorobenzo[b]-2-thiophenecarboxylic acid, 3-chlorobenzo[b]thiophene-2-carboxylic Acid, AKOS AU36-M200, AKOS B000001, AKOS BBB/202, ART-CHEM-BB B000001, BUTTPARK 30\06-07, Benzo[b]thiophene-2-carboxylic acid, 3-chloro-, MFCD00014579
3-chlorobenzo[b]thiophene-2-carboxylic acid (CAS 21211-22-3) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H5ClO2S and a molecular weight of 212.653 g/mol. Key properties include a melting point of 268-272 °C(lit.), a boiling point of 395.1±22.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 192.8±22.3 °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.
- 21211-22-3
- Jingsj CID
- J-32318-2
- Molecular Formula
- C9H5ClO2S
- Molecular Weight
- 212.653 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 268-272 °C(lit.) |
|---|---|
| Boiling Point | 395.1±22.0 °C at 760 mmHg |
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 192.8±22.3 °C |
| Exact Mass | 211.969879 |
| PSA | 65.54000 |
| LogP | 4.13 |
| Vapor Pressure | 0.0±1.0 mmHg at 25°C |
| Refractive Index | 1.720 |
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 3-chlorobenzo[b]thiophene-2-carboxylic acid?
The CAS number of 3-chlorobenzo[b]thiophene-2-carboxylic acid is 21211-22-3.
What are the molecular formula and molecular weight of 3-chlorobenzo[b]thiophene-2-carboxylic acid?
3-chlorobenzo[b]thiophene-2-carboxylic acid has molecular formula C9H5ClO2S and molecular weight 212.653 g/mol.
Is 3-chlorobenzo[b]thiophene-2-carboxylic acid hazardous?
3-chlorobenzo[b]thiophene-2-carboxylic acid has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H319 — Causes serious eye irritation.
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-chlorobenzo[b]thiophene-2-carboxylic acid (CAS 21211-22-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-32318-2 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.