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Dyes and pigments

2-Naphthol

Also known as naphthalen-2-ol, 2-Naphthalenol, beta-naphthol

CAS 135-19-3Formula C10H8OMolar mass 144.17 g/molEC 205-182-7
GHS signal word: Warning. Pictograms: Harmful or irritant, Hazardous to the environment 107 suppliers listed
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2-Naphthol chemical structure, C10H8O, CAS 135-19-3
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White, lustrious, bulky leaflets or white powder. Darkens with age
Melting point
121.6 ยฐC
Boiling point
285 ยฐC
Density
1.28 g/cmยณ at 20 ยฐC
Flash point
153 ยฐC
HS code
290715
Category
Dyes and pigments
UN number
UN 3077
Illustrative photo, 25 kg white woven sacks of powder on a pallet in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is 2-Naphthol?

Plain description, key identifiers and synonyms

2-naphthol is a naphthol carrying a hydroxy group at position 2. It has a role as an antinematodal drug, a radical scavenger, a genotoxin, a mouse metabolite, a human xenobiotic metabolite and a human urinary metabolite.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
naphthalen-2-ol
CAS number
135-19-3 CAS number cross-checkedOther or deprecated CAS: 1321-67-1, 26716-78-9
EC numbers
205-182-7, 215-322-9
Molecular formula
C10H8O
UNII
P2Z71CIK5H
MDL number
MFCD00004067
INCI name
2-NAPHTHOL
InChIKey
JWAZRIHNYRIHIV-UHFFFAOYSA-N
InChI
InChI=1S/C10H8O/c11-10-6-5-8-3-1-2-4-9(8)7-10/h1-7,11H
SMILES (canonical and isomeric)
C1=CC=C2C=C(C=CC2=C1)O

Synonyms

  • naphthalen-2-ol
  • 2-Naphthalenol
  • beta-naphthol
  • Betanaphthol
  • 2-Hydroxynaphthalene
  • Isonaphthol
  • Developer A
  • Developer BN
  • Naphthol B
  • 2-Naphtol
  • beta-Hydroxynaphthalene
  • Azogen developer A
  • beta-Naphtol
  • beta-Napthol
  • Developer AMS
  • 2-Naftolo
  • 2-Naftol
  • Developer sodium
  • C.I. Developer 5
  • beta-Naftolo
  • beta-Monoxynaphthalene
  • beta-Naftol
  • beta-Naphthyl alcohol
  • beta-Naphthyl hydroxide
  • Naphthol, beta
Show all 29 synonyms
  • C.I. Azoic Coupling Component 1
  • Antioxygene BN
  • C.I. 37500
  • naphth-2-ol

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

Appearance
White, lustrious, bulky leaflets or white powder. Darkens with ageexp.
Odour
Faint phenol-like odorexp.
Melting point
121.6 ยฐCexp.
Boiling point
285 ยฐCexp.
Density
1.28 g/cmยณ at 20 ยฐCexp.
Flash point
153 ยฐCexp.
Autoignition temperature
550 ยฐCexp.
Solubility
In water, 7.55 ร— 10โบยฒ mg/L at 25 ยฐCexp.
Vapour pressure
VP: 9.9 mm Hg at 144 ยฐCexp.

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
144.17 g/molcalc.
Exact mass
144.0575 Dacalc.
LogP (octanol/water)
2.55calc.
Topological polar surface area
20.23 ร…ยฒcalc.
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, c1ccc2ccccc2c1

c1ccc2ccccc2c1

2 rings, 10 atoms, the Naphthalene ring system.

17,920 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
GHS09: Hazardous to the environment
Hazardous to the environment
100NFPA 704 rating

Hazard statements

  • H302Harmful if swallowed.
  • H332Harmful if inhaled.
  • H400Very toxic to aquatic life.
Precautionary statements (11)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P301 + P317If swallowed: Get medical help.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P317Get medical help.
  • P330Rinse mouth.
  • P391Collect spillage.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3077
Transport hazard class
9
Packing group
III

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-Naphthol suppliers

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All 107 suppliers
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Where suppliers are based

107 suppliers in 20 countries

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2-Naphthol 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

The principal uses for 2-naphthalenol are in the dyes and pigments industries, eg, as a coupling component for azo dyes, and to make important intermediates, such as 3-hydroxy-2-naphthalenecarboxylic acid (BON) and its anilide (naphthol AS), 2-naphtholsulfonic acids, aminonaphtholsulfonic acids, and 1-nitroso-2-naphthol.

Antioxidants for ... fats, oils, insecticides, synthesis of fungicides, ... antiseptic.

Industrial uses: Pigment, Intermediate, Dye.

Consumer uses: Pigment, Intermediate.

Cosmetic ingredient, INCI name 2-NAPHTHOL(hair dyeing, perfuming)

Roles

  • aetiopathogenetic role
  • animal metabolite
  • anthelminthic drug
  • antiinfective agent
  • antinematodal drug
  • antioxidant
  • antiparasitic agent
  • eukaryotic metabolite
  • genotoxin
  • human metabolite
  • human urinary metabolite
  • human xenobiotic metabolite
  • mammalian metabolite
  • metabolite
  • mouse metabolite
  • nematicide
  • pesticide
  • pharmaceutical
  • radical scavenger
  • xenobiotic metabolite

Functional uses

  • Dye
  • Fragrance
  • Intermediate

Cosmetic functions

  • Hair dyeing
  • Perfuming

How it is made

2-Naphthol is produced by caustic fusion of naphthalene-2-sulfonic acid. Typically, the sodium salt of the sulfonic acid is added gradually to 50% sodium hydroxide liquor at 300 ยฐC, the melt is then heated further at 320 ยฐC in a gas-fired iron vessel with vigorous agitation. After completion of the reaction, the melt is run into excess water, possibly including filtrate from the previous batch at a proven tolerable level, and the naphtholate solution is neutralized to pH 8 with dilute sulfuric acid.

Read more

If the temperature is maintained at >100 ยฐC during neutralization, the crude product comes out of solution as an oil, which is separated, washed with hot water, and distilled under vacuum to give pure 2-naphthol. The molten material is processed through a flaker to give the final product for packaging. The fusion yield is about 80% of the theoretical value, resulting in an overall yield of 70% based on naphthalene.

Alkylation and isomerization are carried out up to 240 ยฐC with a phosphoric acid catalyst. Final catalytic oxidation at 90 - 110 ยฐC gives the hydroperoxide, which is cleaved with dilute sulfuric acid to give 2-naphthol in high overall yield in spite of modest oxidation conversion.

By fusing sodium beta-naphthalene sulfonate with caustic soda. Product is distilled in vacuo and then sublimed.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 604-007-00-5

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: 2-Naphthol, Ref no: 241, Annex ref: II/241

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-Naphthol is traded under.

HS 2907.15Indicative HS code

Naphthols and their salts

World exports in 2024
$53.3M
โˆ’3.0% vs 2023, imports $57.2M
2019 to 2024
Top exporters
  1. China78.7%
  2. India * partner reported15.4%
  3. Netherlands3.2%
Top importers
  1. India * partner reported58.5%
  2. United States12.5%
  3. Japan8.4%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is 2-Naphthol?

2-naphthol is a naphthol carrying a hydroxy group at position 2. It has a role as an antinematodal drug, a radical scavenger, a genotoxin, a mouse metabolite, a human xenobiotic metabolite and a human urinary metabolite.

What is the CAS number of 2-Naphthol?

The CAS registry number of 2-Naphthol is 135-19-3. Other or deprecated CAS numbers: 1321-67-1, 26716-78-9.

What is the molecular formula and weight of 2-Naphthol?

The molecular formula of 2-Naphthol is C10H8O and its molar mass is 144.17 g/mol.

What is 2-Naphthol used for?

The principal uses for 2-naphthalenol are in the dyes and pigments industries, eg, as a coupling component for azo dyes, and to make important intermediates, such as 3-hydroxy-2-naphthalenecarboxylic acid (BON) and its anilide (naphthol AS), 2-naphtholsulfonic acids, aminonaphtholsulfonic acids, and 1-nitroso-2-naphthโ€ฆ

Is 2-Naphthol hazardous?

2-Naphthol carries the GHS signal word "Warning". Main hazards: harmful if swallowed, harmful if inhaled, very toxic to aquatic life. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 2-Naphthol?

2-Naphthol is usually classified under HS code 290715 (Naphthols and their salts). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 2-Naphthol?

CompoundList lists 107 suppliers of 2-Naphthol in China, United States, India, Germany and 16 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-Naphthol in India?

15 suppliers in India list 2-Naphthol 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-Naphthol?

Suppliers quote 2-Naphthol 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-Naphthol

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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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