2-acetyl-3-methylbenzo[b]thiophene

Also known as: 1-(3-methylbenzo[b]thiophen-2-yl)ethan-1-one, 1-(3-methyl-1-benzothiophen-2-yl)ethanone, 2-acetyl-3-methylthianaphthene, 2-acetyl-3-methylbenzothiophene, 1-(3-methyl-1-benzothien-2-yl)ethanone

2-acetyl-3-methylbenzo[b]thiophene (CAS 18781-31-2) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C11H10OS and a molecular weight of 190.26100 g/mol. Key properties include a melting point of 79-80°C, a boiling point of 129-131°C 0,5mm, a density of 1.182 g/cm3 and a flash point of 129-131°C/0.5mm. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 18781-31-2
Jingsj CID: J-16181-9
Molecular Formula: C₁₁H₁₀OS
Molecular Weight: 190.26100 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	79-80°C
Boiling Point	129-131°C 0,5mm
Density	1.182 g/cm3
Flash Point	129-131°C/0.5mm
Exact Mass	190.04500
PSA	45.31000
LogP	3.41230
Vapor Pressure	0.000337mmHg at 25°C
Refractive Index	1.631

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-3-methylbenzo[b]thiophene?

The CAS number of 2-acetyl-3-methylbenzo[b]thiophene is 18781-31-2.

What are the molecular formula and molecular weight of 2-acetyl-3-methylbenzo[b]thiophene?

2-acetyl-3-methylbenzo[b]thiophene has molecular formula C11H10OS and molecular weight 190.26100 g/mol.

What are the upstream and downstream products of 2-acetyl-3-methylbenzo[b]thiophene?

For 2-acetyl-3-methylbenzo[b]thiophene, Upstream Products: 3-Methylbenzo[b]thiophene-2-carboxylic acid, Acetonitrile, 2-Chloro-3-methylbenzo[b]thiophene; Downstream Products: 2-(3-methylbenzo[b]thiophen-2-yl)acetic 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-3-methylbenzo[b]thiophene (CAS 18781-31-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-16181-9 (accessed 2026-11-09).

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