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Cleansing surfactants

Hydroxypyridinone

Also known as 2-Pyridinol-1-oxide, 2-Hydroxypyridine 1-oxide, 1-Hydroxy-2-pyridone

CAS 822-89-9Formula C5H5NO2Molar mass 111.10 g/molEC 212-506-0
GHS signal word: Warning. Pictograms: Harmful or irritant 24 suppliers listed
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Hydroxypyridinone chemical structure, C5H5NO2, CAS 822-89-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
822-89-9
Formula
C5H5NO2
Molar mass
111.10 g/mol
EC number
212-506-0
HS code
293339
Category
Cleansing surfactants

What is Hydroxypyridinone?

Plain description, key identifiers and synonyms

Hydroxypyridinone is a chemical substance with the molecular formula C5H5NO2 and a molar mass of 111.10 g/mol. Its CAS registry number is 822-89-9. The IUPAC name is 1-hydroxypyridin-2-one.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1-hydroxypyridin-2-one
CAS number
822-89-9 CAS number cross-checkedOther or deprecated CAS: 13161-30-3, 1320-69-0
EC numbers
212-506-0, 236-100-8
Molecular formula
C5H5NO2
UNII
YO3915897S
MDL number
MFCD00006195
INCI name
HYDROXYPYRIDINONE
InChIKey
SNUSZUYTMHKCPM-UHFFFAOYSA-N
InChI
InChI=1S/C5H5NO2/c7-5-3-1-2-4-6(5)8/h1-4,8H
SMILES (canonical and isomeric)
C1=CC(=O)N(C=C1)O

Synonyms

  • 2-Pyridinol-1-oxide
  • 2-Hydroxypyridine 1-oxide
  • 1-Hydroxy-2-pyridone
  • 2-Pyridinol, 1-oxide
  • 1-hydroxy-2(1h)-pyridinone
  • 2(1H)-Pyridinone, 1-hydroxy-
  • Hydroxyl-2-pyridone
  • N-hydroxy-2-pyridone
  • N-Hydroxyl-2-pyridone
  • 1-hydroxy-2(1H)-pyridone
  • 2-Pyridinol, N-oxide
  • 1,2-HOPO
  • 2-Hydroxypyridine-N-oxide
  • 2-Hydroxypyridine N-Oxide
  • 1-hydroxy-1,2-dihydropyridin-2-one
  • 1-hydroxypyridin-2-one
  • 1-hydroxypyridin-2(1H)-one
  • Pyridinol, 1-oxide
  • 2-Pyridinol N-oxide
  • HOPO
  • 2-Pyridinol 1-oxide
  • n-hydroxypyridone
  • 2-hydroxypyridine1-oxide
  • 2-hydroxy-pyridine N-oxide
  • 1-Hydroxypyridine-2(1H)-one
Show all 37 synonyms
  • Oxypyrion
  • 2-hydroxypyridin-1-ium-1-olate
  • 2(1H)-Pyridinone, hydroxy-
  • 2-hydroxypyridine-1-oxide
  • 1-hydroxy-2-(1H)-pyridone
  • n-hydroxy-pyridone
  • 1-hyd
  • HPNO
  • N-hydroxy-2-pyridon
  • pyridin-2-ol 1-oxide
  • 1-oxidanylpyridin-2-one
  • 2-hydroxypyridin-1-oxide

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
111.10 g/molcalc.
Exact mass
111.032 Dacalc.
LogP (octanol/water)
0.09calc.
Topological polar surface area
42.23 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
8calc.
Rings
1calc.
Aromatic rings
1calc.
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=c1cccc[nH]1

O=c1cccc[nH]1

1 ring, 7 atoms, the 2-Pyridone ring system.

7,761 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

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • 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.
  • 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

Hydroxypyridinone suppliers

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

All 24 suppliers
24 of 24 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

24 suppliers in 8 countries

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Hydroxypyridinone price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Use classes: Cosmetics.

Cosmetic ingredient, INCI name HYDROXYPYRIDINONE(surfactant - foam boosting, hair dyeing)

Functional uses

  • Dye
  • Foamant

Cosmetic functions

  • Hair dyeing
  • Surfactant - foam boosting

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Hydroxypyridinone and its salts, when used as a substance in hair dye products, Ref no: 1249, Annex ref: II/1249

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Hydroxypyridinone is traded under.

HS 2933.39Indicative HS code

Heterocyclic compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure…

World exports in 2024
$9.16B
−17.9% vs 2023, imports $10.6B
2019 to 2024
Top exporters
  1. China21.5%
  2. India * partner reported12.3%
  3. Ireland11.6%
Top importers
  1. Germany14.2%
  2. United States12.8%
  3. Brazil10.1%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Hydroxypyridinone, based on the data on this page

What is Hydroxypyridinone?

Hydroxypyridinone is a chemical substance with the molecular formula C5H5NO2 and a molar mass of 111.10 g/mol. Its CAS registry number is 822-89-9. The IUPAC name is 1-hydroxypyridin-2-one.

What is the CAS number of Hydroxypyridinone?

The CAS registry number of Hydroxypyridinone is 822-89-9. Other or deprecated CAS numbers: 13161-30-3, 1320-69-0.

What is the molecular formula and weight of Hydroxypyridinone?

The molecular formula of Hydroxypyridinone is C5H5NO2 and its molar mass is 111.10 g/mol.

What is Hydroxypyridinone used for?

Use classes: Cosmetics.

Is Hydroxypyridinone hazardous?

Hydroxypyridinone 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 Hydroxypyridinone?

Hydroxypyridinone is usually classified under HS code 293339 (Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Hydroxypyridinone?

CompoundList lists 24 suppliers of Hydroxypyridinone in China, United States, Czech Republic, Hong Kong and 4 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Hydroxypyridinone?

Suppliers quote Hydroxypyridinone 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 Hydroxypyridinone

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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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