![Molecular structure of 1-(Benzo[b]thiophen-3-yl)ethanone (CAS 1128-05-8)](/images/chem_structures_svg/071/1128-05-8.svg)
1-(Benzo[b]thiophen-3-yl)ethanone
Also known as: 3-Acetylthianaphthene, 3-Acetylbenzothiophene, 3-Acetylbenzo[b]thiophene, 1-(1-benzothiophen-3-yl)ethan-1-one, 1-(benzothiophen-3-yl)ethanone, 1-benzo[b]thiophen-3-ylethanone
1-(Benzo[b]thiophen-3-yl)ethanone (CAS 1128-05-8) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C10H8OS and a molecular weight of 176.235 g/mol. Key properties include a melting point of 61-65ºC, a boiling point of 304.5±15.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 138.0±20.4 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 1128-05-8
- Jingsj CID
- J-45058-8
- Molecular Formula
- C10H8OS
- Molecular Weight
- 176.235 g/mol
- Category
- Aromatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 61-65ºC |
|---|---|
| Boiling Point | 304.5±15.0 °C at 760 mmHg |
| Density | 1.2±0.1 g/cm3 |
| Flash Point | 138.0±20.4 °C |
| Exact Mass | 176.029587 |
| PSA | 45.31000 |
| LogP | 2.78 |
| Vapor Pressure | 0.0±0.6 mmHg at 25°C |
| Refractive Index | 1.647 |
Frequently Asked Questions
What is the CAS number of 1-(Benzo[b]thiophen-3-yl)ethanone?
The CAS number of 1-(Benzo[b]thiophen-3-yl)ethanone is 1128-05-8.
What are the molecular formula and molecular weight of 1-(Benzo[b]thiophen-3-yl)ethanone?
1-(Benzo[b]thiophen-3-yl)ethanone has molecular formula C10H8OS and molecular weight 176.235 g/mol.
What are the upstream and downstream products of 1-(Benzo[b]thiophen-3-yl)ethanone?
For 1-(Benzo[b]thiophen-3-yl)ethanone, Upstream Products: Acetyl chloride, 1-Benzothiophene, 3-iodobenzo[b]thiophene; Downstream Products: Benzo[b]thiophene-3-carboxylic acid, 1-(1-Benzothiophen-3-yl)-2-bromoethanone, 3-phenylbutan-2-one.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "1-(Benzo[b]thiophen-3-yl)ethanone (CAS 1128-05-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-45058-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.