4-Chlorobenzo[b]thiophene-2-carboxylic acid

Also known as: 4-Chloro-1-benzothiophene-2-carboxylic acid, 4-Chlorobenzothiophene-2-carboxylic acid, 4-chloro-2-benzo[b]thiophenecarboxylic acid, 4-chloro-2-benzothiophenecarboxylic acid, 2-carboxy-4-chlorobenzo[b]thiophene, Brexpiprazole Impurity 28, FMX14276-A3, IFLAB-BB F2124-0584

4-Chlorobenzo[b]thiophene-2-carboxylic acid (CAS 23967-57-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H4ClO2S and a molecular weight of 212.653 g/mol. Key properties include a melting point of 220-223ºC, a boiling point of 408.6±25.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 200.9±23.2 °C. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.

CAS No.: 23967-57-9
Jingsj CID: J-1498915-2
Molecular Formula: C₉H₄ClO₂S
Molecular Weight: 212.653 g/mol
Category: Pharma Intermediates
Last updated: 11/2/2026

Request MSDS / TDS

No offers for this compound yet.

Request a quote

Physicochemical Properties

Melting Point	220-223ºC
Boiling Point	408.6±25.0 °C at 760 mmHg
Density	1.5±0.1 g/cm3
Flash Point	200.9±23.2 °C
Exact Mass	211.969879
PSA	65.54000
LogP	4.48
Vapor Pressure	0.0±1.0 mmHg at 25°C
Refractive Index	1.720

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 4-Chlorobenzo[b]thiophene-2-carboxylic acid?

The CAS number of 4-Chlorobenzo[b]thiophene-2-carboxylic acid is 23967-57-9.

What are the molecular formula and molecular weight of 4-Chlorobenzo[b]thiophene-2-carboxylic acid?

4-Chlorobenzo[b]thiophene-2-carboxylic acid has molecular formula C9H4ClO2S and molecular weight 212.653 g/mol.

What are the upstream and downstream products of 4-Chlorobenzo[b]thiophene-2-carboxylic acid?

For 4-Chlorobenzo[b]thiophene-2-carboxylic acid, Upstream Products: methyl 4-chlorobenzo[b]thiophene-2-carboxylate, 2,6-Dichlorobenzaldehyde, Thioglycolic acid; Downstream Products: 4-Chloro-1-benzothiophene.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 11/2/2026

How to cite: Jingsj. "4-Chlorobenzo[b]thiophene-2-carboxylic acid (CAS 23967-57-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1498915-2 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.