5-Chlorobenzofuran-3(2H)-one

Also known as: 5-Chloro-3-benzofuranone, 5-Chlorobenzofuran-3-one, 5-Chloro-1-benzofuran-3(2H)-one, 5-Chloro-2,3-dihydro-1-benzofuran-3-one, 5-Chlorocoumaran-3-one, 5-Chloro-2,3-dihydro-3-oxobenzo[b]furan, 5-Chloro-3(2H)-benzofuranone, 5-Chlor-benzofuran-3-on

5-Chlorobenzofuran-3(2H)-one (CAS 3261-05-0) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C8H5ClO2 and a molecular weight of 168.57700 g/mol. Key properties include a boiling point of 304.3ºC at 760 mmHg, a density of 1.428 g/cm3 and a flash point of 145.6ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 3261-05-0
Jingsj CID: J-1316216-8
Molecular Formula: C₈H₅ClO₂
Molecular Weight: 168.57700 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	304.3ºC at 760 mmHg
Density	1.428 g/cm3
Flash Point	145.6ºC
Exact Mass	167.99800
PSA	26.30000
LogP	1.91510
Refractive Index	1.601

Customs & Trade Information

HS Code	2932999099
Summary	2932999099. other heterocyclic compounds with oxygen hetero-atom(s) only. 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 5-Chlorobenzofuran-3(2H)-one?

The CAS number of 5-Chlorobenzofuran-3(2H)-one is 3261-05-0.

What are the molecular formula and molecular weight of 5-Chlorobenzofuran-3(2H)-one?

5-Chlorobenzofuran-3(2H)-one has molecular formula C8H5ClO2 and molecular weight 168.57700 g/mol.

What are the upstream and downstream products of 5-Chlorobenzofuran-3(2H)-one?

For 5-Chlorobenzofuran-3(2H)-one, Upstream Products: Diazomethane, N-Methyl-N-nitrosotoluene-4-sulphonamide, 5-Chloro-2-methoxybenzoyl chloride; Downstream Products: 5-Chloro-2,3-dihydrobenzofuran-3-amine, 5-Chloro-2,3-dihydrobenzofuran-3-amine hydrochloride.

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

Last updated: 8/21/2026

How to cite: Jingsj. "5-Chlorobenzofuran-3(2H)-one (CAS 3261-05-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1316216-8 (accessed 2026-11-09).

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