![Molecular structure of Benzo[b]thiophene-2,3-dione (CAS 493-57-2)](/images/chem_structures_svg/338/493-57-2.svg)
Benzo[b]thiophene-2,3-dione
Also known as: 1-benzothiophene-2,3-dione, 2,3-Benzo[b]thiophenedione, 2,3-Dihydro-1-benzothiophene-2,3-dione, 2,3-Dioxo-2,3-dihydrothionaphthene, 2,3-Thionaphthenequinone, 2,3-dihydrobenzo[b]thiophene-2,3-dione, Benzo(b)thiophene-2,3-dione, Benzothiophene-2,3-dione, NSC 114478, Thianaphthenequinone, Thioisatin, Thionaphthenquinone, Thionaphthoquinone, benzo[b]thiophene-2,3-quinone, benzothiophene-2,3-quinone
Benzo[b]thiophene-2,3-dione (CAS 493-57-2) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C8H4O2S and a molecular weight of 164.18100 g/mol. Key properties include a melting point of 119-121ºC, a boiling point of 247ºC at 760mmHg, a density of 1.479g/cm3 and a flash point of 103ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 493-57-2
- Jingsj CID
- J-1071837-3
- Molecular Formula
- C8H4O2S
- Molecular Weight
- 164.18100 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 119-121ºC |
|---|---|
| Boiling Point | 247ºC at 760mmHg |
| Density | 1.479g/cm3 |
| Flash Point | 103ºC |
| Exact Mass | 163.99300 |
| PSA | 59.44000 |
| LogP | 1.50160 |
| Vapor Pressure | 0.0263mmHg at 25°C |
| Refractive Index | 1.686 |
| Storage Conditions | 20°C |
Frequently Asked Questions
What is the CAS number of Benzo[b]thiophene-2,3-dione?
The CAS number of Benzo[b]thiophene-2,3-dione is 493-57-2.
What are the molecular formula and molecular weight of Benzo[b]thiophene-2,3-dione?
Benzo[b]thiophene-2,3-dione has molecular formula C8H4O2S and molecular weight 164.18100 g/mol.
What are the upstream and downstream products of Benzo[b]thiophene-2,3-dione?
For Benzo[b]thiophene-2,3-dione, Upstream Products: Oxalyl chloride; Downstream Products: Benzo[b]thiophene-3-carboxylic acid, Thioxanthen-9-one, 1-Benzothiophene.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Benzo[b]thiophene-2,3-dione (CAS 493-57-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1071837-3 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.