2-Acetyl-4,5-dichlorothiophene

Also known as: 1-(4,5-Dichloro-2-thienyl)ethanone, 1-(4,5-Dichlorothiophen-2-yl)ethanone, 1-(4,5-dichlorothiophen-2-yl)ethan-1-one, AKOS 91935, Chlorphenamine Impurity 21, Ethanone, 1-(4,5-dichloro-2-thienyl)-, 2-ACETYL-4,5-DICHLOROTHIOPHENE, 1-(4,5-Dichlor-[2]thienyl)-aethanon, 1-(4,5-Dichlor-2-thienyl)-ethanon, 2.3-Dichlor-5-acetyl-thiophen, 2-Acetyl-4.5-dichlor-thiophen

2-Acetyl-4,5-dichlorothiophene (CAS 57681-59-1) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C6H4Cl2OS and a molecular weight of 195.06600 g/mol. Key properties include a boiling point of 300.8ºC at 760mmHg, a density of 1.452g/cm3 and a flash point of 135.7ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 57681-59-1
Jingsj CID: J-1437505-4
Molecular Formula: C₆H₄Cl₂OS
Molecular Weight: 195.06600 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	300.8ºC at 760mmHg
Density	1.452g/cm3
Flash Point	135.7ºC
Exact Mass	193.93600
PSA	45.31000
LogP	3.25750
Refractive Index	1.575

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-Acetyl-4,5-dichlorothiophene?

The CAS number of 2-Acetyl-4,5-dichlorothiophene is 57681-59-1.

What are the molecular formula and molecular weight of 2-Acetyl-4,5-dichlorothiophene?

2-Acetyl-4,5-dichlorothiophene has molecular formula C6H4Cl2OS and molecular weight 195.06600 g/mol.

What are the upstream and downstream products of 2-Acetyl-4,5-dichlorothiophene?

For 2-Acetyl-4,5-dichlorothiophene, Upstream Products: 2,3-Dichlorothiophene, N,N-Dimethylformamide, 2-Acetylthiophene; Downstream Products: 1-(4-Chlorothiophen-2-yl)ethanone, 4-chlorothiophene-2-carboxylic acid, 4,5-Dichlorothiophene-2-carboxylic acid.

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. "2-Acetyl-4,5-dichlorothiophene (CAS 57681-59-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1437505-4 (accessed 2026-11-09).

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