4-Hydroxyquinoline

Also known as: 4-Quinolinol, Quinolin-4-ol, 4(1H)-QUINOLINONE, 4-Quinolone, 1H-Quinolin-4-one, Kynurine, Quinolin-4(1H)-one, 4-oxo-1,4-dihydroquinoline, MFCD00006777

4-Hydroxyquinoline (CAS 611-36-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H7NO and a molecular weight of 145.158 g/mol. Key properties include a melting point of 200-202 °C(lit.), a boiling point of 313.0±15.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 143.1±20.4 °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.: 611-36-9
Jingsj CID: J-19827-6
Molecular Formula: C₉H₇NO
Molecular Weight: 145.158 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

Request MSDS / TDS

No offers for this compound yet.

Request a quote

Physicochemical Properties

Melting Point	200-202 °C(lit.)
Boiling Point	313.0±15.0 °C at 760 mmHg
Density	1.3±0.1 g/cm3
Flash Point	143.1±20.4 °C
Exact Mass	145.052765
PSA	33.12000
LogP	2.45
Vapor Pressure	0.0±0.7 mmHg at 25°C
Refractive Index	1.691

GHS Safety & Compliance

IrritantSignal word: Warning

H315 — Causes skin irritation
H319 — Causes serious eye irritation
H335 — May cause respiratory irritation

Activity & Biological Data

Additional Information	[1]. Pellicciari R, et al. Modulation of the kynurine pathway of tryptophan metabolism in search for neuroprotective agents. Focus on kynurenine-3-hydroxylase. Adv Exp Med Biol. 2003;527:621-8. [2]. Marija Pinne, et al. Cytochrome P450 Gene Regulation: Reporter Assays to Assess Aryl Hydrocarbon Receptor (HLHE76, AhR) Activation and Antagonism. Cytochrome P450. pp 157-174. [3]. Opitz CA, et al. An endogenous tumour-promoting ligand of the human aryl hydrocarbon receptor. Nature. 2011 Oct 5;478(7368):197-203.

Additional Information

[1]. Pellicciari R, et al. Modulation of the kynurine pathway of tryptophan metabolism in search for neuroprotective agents. Focus on kynurenine-3-hydroxylase. Adv Exp Med Biol. 2003;527:621-8. [2]. Marija Pinne, et al. Cytochrome P450 Gene Regulation: Reporter Assays to Assess Aryl Hydrocarbon Receptor (HLHE76, AhR) Activation and Antagonism. Cytochrome P450. pp 157-174. [3]. Opitz CA, et al. An endogenous tumour-promoting ligand of the human aryl hydrocarbon receptor. Nature. 2011 Oct 5;478(7368):197-203.

Customs & Trade Information

HS Code	2933499090
Summary	2933499090. other compounds containing in the structure a quinoline or isoquinoline ring-system (whether or not hydrogenated), not further fused. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 4-Hydroxyquinoline?

The CAS number of 4-Hydroxyquinoline is 611-36-9.

What are the molecular formula and molecular weight of 4-Hydroxyquinoline?

4-Hydroxyquinoline has molecular formula C9H7NO and molecular weight 145.158 g/mol.

Is 4-Hydroxyquinoline hazardous?

4-Hydroxyquinoline 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 4-Hydroxyquinoline?

For 4-Hydroxyquinoline, Upstream Products: 7-Chloro-2,3-dihydroquinolin-4(1H)-one, Meldrum's acid, 4-Chloroquinoline; Downstream Products: 4-Chloro-3-nitroquinoline, 4-Methoxyquinoline, 4-Amino-3-nitroquinoline.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "4-Hydroxyquinoline (CAS 611-36-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-19827-6 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.