6-Hydroxy-3,4-dihydroquinolin-2(1H)-one
Also known as: 6-Hydroxy-3,4-dihydro-2(1H)-quinolinone, 6-Hydroxy-1,2,3,4-tetrahydro-2-quinolinone, 6-Hydroxy-2-oxo-1,2,3,4-tetrahydroquinoline, 3,4-Dihydro-6-hydroxy-2(1H)-quinolinone, 6-Hydroxy-3,4-dihydrocarbostyril, 6-Hydroxy-3,4-dihydroquinolin-2(1H)-one, 6-HQ, Intermediate of Cilostazol
6-Hydroxy-3,4-dihydroquinolin-2(1H)-one (CAS 54197-66-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H9NO2 and a molecular weight of 163.173 g/mol. Key properties include a melting point of 236-240 °C, a boiling point of 424.5±45.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 210.5±28.7 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 54197-66-9
- Jingsj CID
- J-14413-3
- Molecular Formula
- C9H9NO2
- Molecular Weight
- 163.173 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 236-240 °C |
|---|---|
| Boiling Point | 424.5±45.0 °C at 760 mmHg |
| Density | 1.3±0.1 g/cm3 |
| Flash Point | 210.5±28.7 °C |
| Exact Mass | 163.063324 |
| PSA | 49.33000 |
| LogP | 0.60 |
| Vapor Pressure | 0.0±1.0 mmHg at 25°C |
| Refractive Index | 1.604 |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2933790090 |
|---|---|
| Summary | 2933790090. other lactams. VAT:17.0%. Tax rebate rate:9.0%. . MFN tariff:9.0%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of 6-Hydroxy-3,4-dihydroquinolin-2(1H)-one?
The CAS number of 6-Hydroxy-3,4-dihydroquinolin-2(1H)-one is 54197-66-9.
What are the molecular formula and molecular weight of 6-Hydroxy-3,4-dihydroquinolin-2(1H)-one?
6-Hydroxy-3,4-dihydroquinolin-2(1H)-one has molecular formula C9H9NO2 and molecular weight 163.173 g/mol.
Is 6-Hydroxy-3,4-dihydroquinolin-2(1H)-one hazardous?
6-Hydroxy-3,4-dihydroquinolin-2(1H)-one has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.
What are the upstream and downstream products of 6-Hydroxy-3,4-dihydroquinolin-2(1H)-one?
For 6-Hydroxy-3,4-dihydroquinolin-2(1H)-one, Upstream Products: Aluminium chloride, 3,4-Dihydroquinolin-2(1H)-one, 4-Aminophenol; Downstream Products: 6-[4-(1-Cyclohexyl-1H-tetrazol-5-yl)butoxy]-1-[4-(1-cyclohexyl-1H-tetrazol-5-yl)butyl]-3,4-dihydro-2(1H)-quinolinone, Cilostazol, 3,4-Dehydro Cilostazol.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "6-Hydroxy-3,4-dihydroquinolin-2(1H)-one (CAS 54197-66-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-14413-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.