3-Mercapto-2-butanone
Also known as: 3-Sulfanyl-2-butanone, 3-Sulfanylbutan-2-one, 2-Butanone, 3-mercapto-, 3-Mercapto-2-butanone solution, 3-Mercapto-2-butanone (FEMA No.3298), UNII:99G79565PJ, MFCD00085206, EINECS 255-082-2, (3R)-3-mercapto-2-butanone
3-Mercapto-2-butanone (CAS 40789-98-8) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C4H8OS and a molecular weight of 104.171 g/mol. Key properties include a boiling point of 140.0±23.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 38.5±22.6 °C. It is classified under GHS with signal word Warning and hazard statements H226 — Flammable liquid and vapour, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 40789-98-8
- Jingsj CID
- J-1504147-1
- Molecular Formula
- C4H8OS
- Molecular Weight
- 104.171 g/mol
- Category
- Ketones
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 140.0±23.0 °C at 760 mmHg |
|---|---|
| Density | 1.0±0.1 g/cm3 |
| Flash Point | 38.5±22.6 °C |
| Exact Mass | 104.029587 |
| PSA | 55.87000 |
| LogP | 0.67 |
| Vapor Pressure | 6.2±0.3 mmHg at 25°C |
| Refractive Index | 1.449 |
GHS Safety & Compliance
- H226 — Flammable liquid and vapour
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2930909090 |
|---|---|
| Summary | 2930909090. other organo-sulphur compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 3-Mercapto-2-butanone?
The CAS number of 3-Mercapto-2-butanone is 40789-98-8.
What are the molecular formula and molecular weight of 3-Mercapto-2-butanone?
3-Mercapto-2-butanone has molecular formula C4H8OS and molecular weight 104.171 g/mol.
Is 3-Mercapto-2-butanone hazardous?
3-Mercapto-2-butanone has GHS signal word Warning and hazard statements H226 — Flammable liquid and vapour; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of 3-Mercapto-2-butanone?
For 3-Mercapto-2-butanone, Upstream Products: 3-Chloro-2-butanone, Acetoin, D-(+)-Xylose; Downstream Products: 3-Methylthio-2-butanone, (2Z)-4,5-dimethyl-N,3-diphenyl-1,3-thiazol-2(3H)-imine.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "3-Mercapto-2-butanone (CAS 40789-98-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1504147-1 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.