3,4-Dihydroquinolin-2(1H)-one
Also known as: Hydrocarbostyril, 1,2,3,4-Tetrahydroquinolin-2-one, 3,4-Dihydro-2(1H)-quinolinone, 3,4-Dihydrocarbostyril, 2-Oxo-1,2,3,4-tetrahydroquinoline, Dihydrocarbostyril, Dihydro-α-quinolone
3,4-Dihydroquinolin-2(1H)-one (CAS 553-03-7) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H9NO and a molecular weight of 147.174 g/mol. Key properties include a melting point of 165-167ºC, a boiling point of 328.1±31.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 189.4±9.8 °C. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H317 — May cause an allergic skin reaction. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 553-03-7
- Jingsj CID
- J-1451909-6
- Molecular Formula
- C9H9NO
- Molecular Weight
- 147.174 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 165-167ºC |
|---|---|
| Boiling Point | 328.1±31.0 °C at 760 mmHg |
| Density | 1.1±0.1 g/cm3 |
| Flash Point | 189.4±9.8 °C |
| Exact Mass | 147.068420 |
| PSA | 29.10000 |
| LogP | 1.34 |
| Vapor Pressure | 0.0±0.7 mmHg at 25°C |
| Refractive Index | 1.564 |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H317 — May cause an allergic skin reaction
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Frequently Asked Questions
What is the CAS number of 3,4-Dihydroquinolin-2(1H)-one?
The CAS number of 3,4-Dihydroquinolin-2(1H)-one is 553-03-7.
What are the molecular formula and molecular weight of 3,4-Dihydroquinolin-2(1H)-one?
3,4-Dihydroquinolin-2(1H)-one has molecular formula C9H9NO and molecular weight 147.174 g/mol.
Is 3,4-Dihydroquinolin-2(1H)-one hazardous?
3,4-Dihydroquinolin-2(1H)-one has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H317 — May cause an allergic skin reaction.
What are the upstream and downstream products of 3,4-Dihydroquinolin-2(1H)-one?
For 3,4-Dihydroquinolin-2(1H)-one, Upstream Products: 2-Nitrocinnamic acid, 3-(2-Aminophenyl)propan-1-ol, (E)-2,3-dihydro-1H-inden-1-one oxime; Downstream Products: 6-bromo-3,4-dihydro-1H-quinolin-2-one, 6-bromo-3,4-dihydroquinolin-2(1H)-thione, 1,2,3,4-Tetrahydroquinoline.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "3,4-Dihydroquinolin-2(1H)-one (CAS 553-03-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1451909-6 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.