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Heterocyclic building blocks

2,4-Dihydroxyquinoline

Also known as 4-Hydroxy-2-quinolone, 4-Hydroxycarbostyril, 2(1H)-Quinolinone, 4-hydroxy-

CAS 86-95-3Formula C9H7NO2Molar mass 161.16 g/molEC 201-711-0
GHS signal word: Warning. Pictograms: Harmful or irritant, Serious health hazard 23 suppliers listed
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2,4-Dihydroxyquinoline chemical structure, C9H7NO2, CAS 86-95-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
86-95-3
Formula
C9H7NO2
Molar mass
161.16 g/mol
EC number
201-711-0
HS code
293349
Category
Heterocyclic building blocks

What is 2,4-Dihydroxyquinoline?

Plain description, key identifiers and synonyms

4-hydroxy-2-quinolone is a heteroaryl hydroxy compound that is 2-quinolone substituted at position 4 by a hydroxy group. It is a quinolone and a heteroaryl hydroxy compound.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-hydroxy-1H-quinolin-2-one
CAS number
86-95-3 CAS number cross-checkedOther or deprecated CAS: 70254-43-2, 70254-44-3
EC number
201-711-0
Molecular formula
C9H7NO2
UNII
N58HX8G9CN
MDL number
MFCD00006744, MFCD00277932, MFCD18836846
InChIKey
HDHQZCHIXUUSMK-UHFFFAOYSA-N
InChI
InChI=1S/C9H7NO2/c11-8-5-9(12)10-7-4-2-1-3-6(7)8/h1-5H,(H2,10,11,12)
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C(=CC(=O)N2)O

Synonyms

  • 4-Hydroxy-2-quinolone
  • 4-Hydroxycarbostyril
  • 2(1H)-Quinolinone, 4-hydroxy-
  • 4-Hydroxy-2-quinolinone
  • Hydroxycarbostyril
  • Carbostyril, 4-hydroxy-
  • DHQ quinolinol
  • 2,4-Quinolinediol
  • Quinoline-2,4-diol
  • 4-Hydroxyquinolin-2(1H)-one
  • 2-Hydroxyquinolin-4(1H)-one
  • 4-hydroxy-1,2-dihydroquinolin-2-one
  • 4-hydroxy-2(1H)-quinolone
  • 4-hydroxy-1H-quinolin-2-one
  • 4-Hydroxy-2(1H)-quinolinone
  • 4(1H)-Quinolinone, 2-hydroxy-
  • 2-hydroxy-4(1H)-quinolone
  • 2-hydroxy-1H-quinolin-4-one
  • 4-hydroxyhydroquinolin-2-one
  • 4-Hydroxycarbostyril, 4-Hydroxyquinolin-2(1H)-one, 4-Hydroxyquinoline-2(1H)-one, NSC 13962
  • 2.4-Quinolinediol
  • 2,4-Dihydroxy quinoline
  • Dihydroxyquinoine
  • 2-4-Quinolinediol
  • 2-Hydroxy-4(1H)-quinolinone
Show all 36 synonyms
  • 2,4-Quinolinediol-
  • 4-hydroxy quinolinone
  • 2.4-dihydroxy quinoline
  • 4-hydroxyquinolin-2-one
  • 2, 4-Dihydroxyquinoline-
  • quinoline, 2,4-dihydroxy-
  • 2,4-Quinolinediol, 97%
  • 4-hydroxy-2(l H)-quinolinone
  • 4-hydroxy-quinolin-2(1H)-one
  • 4-Hydroxy-2(1H)-quinolinone #
  • 2,4-Dihydroxyguinoline, na

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
161.16 g/molcalc.
Exact mass
161.0477 Dacalc.
LogP (octanol/water)
1.23calc.
Topological polar surface area
53.09 ร…ยฒcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
12calc.
Rings
2calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=c1ccc2ccccc2[nH]1

O=c1ccc2ccccc2[nH]1

2 rings, 11 atoms, the 2-Hydroxyquinoline ring system.

2,717 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
  • H341Suspected of causing genetic defects.
Precautionary statements (18)
  • P203Obtain, read and follow all safety instructions before use.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

2,4-Dihydroxyquinoline suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 23 suppliers
23 of 23 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

23 suppliers in 9 countries

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2,4-Dihydroxyquinoline price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code 2,4-Dihydroxyquinoline is traded under.

HS 2933.49Indicative HS code

Compounds containing in the structure a quinoline or isoquinoline ring-system (whetherโ€ฆ

World exports in 2024
$939M
โˆ’14.6% vs 2023, imports $1.48B
2019 to 2024
Top exporters
  1. China30.1%
  2. India * partner reported16.7%
  3. Switzerland * partner reported14.1%
Top importers
  1. United Kingdom19.2%
  2. Germany16.0%
  3. Romania8.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for 2,4-Dihydroxyquinoline is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 2,4-Dihydroxyquinoline, based on the data on this page

What is 2,4-Dihydroxyquinoline?

4-hydroxy-2-quinolone is a heteroaryl hydroxy compound that is 2-quinolone substituted at position 4 by a hydroxy group. It is a quinolone and a heteroaryl hydroxy compound.

What is the CAS number of 2,4-Dihydroxyquinoline?

The CAS registry number of 2,4-Dihydroxyquinoline is 86-95-3. Other or deprecated CAS numbers: 70254-43-2, 70254-44-3.

What is the molecular formula and weight of 2,4-Dihydroxyquinoline?

The molecular formula of 2,4-Dihydroxyquinoline is C9H7NO2 and its molar mass is 161.16 g/mol.

What is 2,4-Dihydroxyquinoline used for?

Known uses and roles of 2,4-Dihydroxyquinoline include building blocks in research and laboratory and screening compounds in research and laboratory.

Is 2,4-Dihydroxyquinoline hazardous?

2,4-Dihydroxyquinoline carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 2,4-Dihydroxyquinoline?

2,4-Dihydroxyquinoline is usually classified under HS code 293349 (Compounds containing in the structure a quinoline or isoquinoline ring-system (whetherโ€ฆ). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 2,4-Dihydroxyquinoline?

CompoundList lists 23 suppliers of 2,4-Dihydroxyquinoline in China, United States, Canada, Hong Kong and 5 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy 2,4-Dihydroxyquinoline in India?

1 supplier in India list 2,4-Dihydroxyquinoline on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of 2,4-Dihydroxyquinoline?

Suppliers quote 2,4-Dihydroxyquinoline on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle 2,4-Dihydroxyquinoline

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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