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Heterocyclic building blocks

3-Hydroxyisoquinoline

Also known as Isoquinolin-3-ol, Isoquinolin-3(2H)-one, 3-Isoquinolinol

CAS 7651-81-2Formula C9H7NOMolar mass 145.16 g/molEC 624-369-8
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant 5 suppliers listed
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3-Hydroxyisoquinoline chemical structure, C9H7NO, CAS 7651-81-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
7651-81-2
Formula
C9H7NO
Molar mass
145.16 g/mol
EC number
624-369-8
HS code
293349
Category
Heterocyclic building blocks

What is 3-Hydroxyisoquinoline?

Plain description, key identifiers and synonyms

3-Hydroxyisoquinoline is a chemical substance with the molecular formula C9H7NO and a molar mass of 145.16 g/mol. Its CAS registry number is 7651-81-2. The IUPAC name is 2H-isoquinolin-3-one.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2H-isoquinolin-3-one
CAS number
7651-81-2 CAS number cross-checkedOther or deprecated CAS: 134434-31-4
EC number
624-369-8
Molecular formula
C9H7NO
MDL number
MFCD00075524, MFCD07809542
InChIKey
GYPOFOQUZZUVQL-UHFFFAOYSA-N
InChI
InChI=1S/C9H7NO/c11-9-5-7-3-1-2-4-8(7)6-10-9/h1-6H,(H,10,11)
SMILES (canonical and isomeric)
C1=CC2=CC(=O)NC=C2C=C1

Synonyms

  • Isoquinolin-3-ol
  • Isoquinolin-3(2H)-one
  • 3-Isoquinolinol
  • 2H-isoquinolin-3-one
  • 2,3-dihydroisoquinolin-3-one
  • 3-Isoquinolinol(9CI)
  • 2H-3-isoquinolone
  • isoquinolinium-3-oxide
  • 3-Hydroxyisoquinoline, 99%
  • 3-Hydroxyisoquino
  • 3-hydroxy-isoquinoline
  • isoquinoline, 3-hydroxy-

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
145.16 g/molcalc.
Exact mass
145.0528 Dacalc.
LogP (octanol/water)
1.53calc.
Topological polar surface area
32.86 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
11calc.
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=c1cc2ccccc2c[nH]1

O=c1cc2ccccc2c[nH]1

2 rings, 11 atoms. This chemical is the scaffold itself.

137 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H302Harmful if swallowed.
  • H315Causes skin irritation.
  • H318Causes serious eye damage.
  • H319Causes serious eye irritation.
Precautionary statements (15)
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • 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.
  • 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

3-Hydroxyisoquinoline suppliers

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

All 5 suppliers
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Where suppliers are based

5 suppliers in 2 countries

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3-Hydroxyisoquinoline price

Indicative price range per kg from live supplier offers

No published prices right now

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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

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code 3-Hydroxyisoquinoline is traded under.

HS 2933.49Indicative HS code

Compounds containing in the structure a quinoline or isoquinoline ring-system (whether…

World exports in 2024
$939M
−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 3-Hydroxyisoquinoline is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 3-Hydroxyisoquinoline, based on the data on this page

What is 3-Hydroxyisoquinoline?

3-Hydroxyisoquinoline is a chemical substance with the molecular formula C9H7NO and a molar mass of 145.16 g/mol. Its CAS registry number is 7651-81-2. The IUPAC name is 2H-isoquinolin-3-one.

What is the CAS number of 3-Hydroxyisoquinoline?

The CAS registry number of 3-Hydroxyisoquinoline is 7651-81-2. Other or deprecated CAS numbers: 134434-31-4.

What is the molecular formula and weight of 3-Hydroxyisoquinoline?

The molecular formula of 3-Hydroxyisoquinoline is C9H7NO and its molar mass is 145.16 g/mol.

What is 3-Hydroxyisoquinoline used for?

Known uses and roles of 3-Hydroxyisoquinoline include building blocks in research and laboratory and screening compounds in research and laboratory.

Is 3-Hydroxyisoquinoline hazardous?

3-Hydroxyisoquinoline carries the GHS signal word "Danger". Main hazards: harmful if swallowed, causes skin irritation, causes serious eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 3-Hydroxyisoquinoline?

3-Hydroxyisoquinoline is usually classified under HS code 293349 (Compounds containing in the structure a quinoline or isoquinoline ring-system (whether…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 3-Hydroxyisoquinoline?

CompoundList lists 5 suppliers of 3-Hydroxyisoquinoline in United States and China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of 3-Hydroxyisoquinoline?

Suppliers quote 3-Hydroxyisoquinoline 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 3-Hydroxyisoquinoline

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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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