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Impurities and reference standards

1-Naphthol

Also known as naphthalen-1-ol, alpha-naphthol, 1-Naphthalenol

CAS 90-15-3Formula C10H8OMolar mass 144.17 g/molEC 201-969-4
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant 125 suppliers listed
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1-Naphthol chemical structure, C10H8O, CAS 90-15-3
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Yellow monoclinic needles from water
Melting point
96 °C
Boiling point
288 °C
Density
1.0954 at 98.7 °C/4 °C
Flash point
153 °C
HS code
290715
Category
Impurities and reference standards
Illustrative photo, yellow pigment powder in an open fibre drum in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is 1-Naphthol?

Plain description, key identifiers and synonyms

1-naphthol is a naphthol carrying a hydroxy group at position 1. It has a role as a genotoxin and a human xenobiotic metabolite.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
naphthalen-1-ol
CAS number
90-15-3 CAS number cross-checkedOther or deprecated CAS: 1321-67-1, 26716-77-8, 50356-21-3
EC numbers
201-969-4, 215-322-9
Molecular formula
C10H8O
UNII
2A71EAQ389
MDL number
MFCD00003930
INCI name
1-NAPHTHOL
InChIKey
KJCVRFUGPWSIIH-UHFFFAOYSA-N
InChI
InChI=1S/C10H8O/c11-10-7-3-5-8-4-1-2-6-9(8)10/h1-7,11H
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C=CC=C2O

Synonyms

  • naphthalen-1-ol
  • alpha-naphthol
  • 1-Naphthalenol
  • 1-Hydroxynaphthalene
  • Furro ER
  • Ursol ERN
  • Fouramine ERN
  • Fourrine ERN
  • Tertral ERN
  • Basf Ursol ERN
  • Fourrine 99
  • Nako TRB
  • Zoba ERN
  • alpha-Hydroxynaphthalene
  • Durafur developer D
  • C.I. Oxidation Base 33
  • CI Oxidation Base 33
  • C.I. 76605
  • CI 76605
  • Naphthol
  • Naphthalenol
  • 1-Naphthyl alcohol
  • a-naphthol
  • Duloxetine EP Impurity D
  • 1-napthol
Show all 34 synonyms
  • hydroxynaphthalene
  • Naphthol-1
  • Naphthyl-1-ol
  • Naphthol, 1-
  • alpha-Naphthyl alcohol
  • napthalenol
  • alpha-napthol
  • napthyl alcohol
  • 1-Naphtyol

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
Yellow monoclinic needles from waterexp.
Odour
Phenolic odorexp.
Taste
Disagreeable, burning tasteexp.
Melting point
96 °Cexp.
Boiling point
288 °Cexp.
Density
1.0954 at 98.7 °C/4 °Cexp.
Flash point
153 °Cexp.
Autoignition temperature
541.7 °Cexp.
Solubility
In water, 866 mg/L at 25 °Cexp.
Vapour pressure
1.7 mm Hg at 110 °C (2.74 × 10⁻⁴ mm Hg at 25 °C) /extrapolated to solid-phase/exp.

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 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, 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
Danger
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H315Causes skin irritation.
  • H318Causes serious eye damage.
  • H335May cause respiratory irritation.
Precautionary statements (19)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • 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.
  • P271Use only outdoors or in a well-ventilated area.
  • 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.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • 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.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P332 + P317If skin irritation occurs: 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

1-Naphthol suppliers

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

All 125 suppliers
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Where suppliers are based

125 suppliers in 21 countries

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1-Naphthol price

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Uses and applications

What the substance is used for, by industry and function

For the dyes mordant black 11, acid brown 6, chem int for dye coupling agents for azo dyes.

Manufacture of dyes, intermediates, synthetic perfumes, also in microscopy.

Production of agrochemicals, such as sevin and carbaryl, drugs, rubber antioxidants, dye intermediates.

Industrial uses: Intermediate.

Use classes: Pesticide transformation products, Cosmetics.

Cosmetic ingredient, INCI name 1-NAPHTHOL(hair dyeing)

Roles

  • aetiopathogenetic role
  • animal metabolite
  • eukaryotic metabolite
  • genotoxin
  • human metabolite
  • human xenobiotic metabolite
  • mammalian metabolite
  • metabolite
  • xenobiotic metabolite

Functional uses

  • Dye
  • Filler
  • Intermediate
  • Pigment

Cosmetic functions

  • Hair dyeing

How it is made

Prepd by fusing the sodium salt of alpha-naphthalenesulfonic acid with NaOH: Tyrer, US pats 2,407,044, 2,407,055 (1946 and 1948)

Oxidation of naphthalene: Loeb, US pat 2.033,903 (1962 to Union Carbide)

Two-stage catalytic process involving the oxidation of tetralin to 1-tetralol and 1-tetralone followed by dehydrogenation.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 604-029-00-5

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex III, restricted in cosmetics
    Name: 1-NAPHTHOL, Ref no: 16, Annex ref: III/16

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 1-Naphthol is traded under.

HS 2907.15Indicative HS code

Naphthols and their salts

World exports in 2024
$53.3M
−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 1-Naphthol is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 1-Naphthol, based on the data on this page

What is 1-Naphthol?

1-naphthol is a naphthol carrying a hydroxy group at position 1. It has a role as a genotoxin and a human xenobiotic metabolite.

What is the CAS number of 1-Naphthol?

The CAS registry number of 1-Naphthol is 90-15-3. Other or deprecated CAS numbers: 1321-67-1, 26716-77-8, 50356-21-3.

What is the molecular formula and weight of 1-Naphthol?

The molecular formula of 1-Naphthol is C10H8O and its molar mass is 144.17 g/mol.

What is 1-Naphthol used for?

For the dyes mordant black 11, acid brown 6, chem int for dye coupling agents for azo dyes. Manufacture of dyes, intermediates, synthetic perfumes, also in microscopy. Production of agrochemicals, such as sevin and carbaryl, drugs, rubber antioxidants, dye intermediates. Industrial uses: Intermediate.

Is 1-Naphthol hazardous?

1-Naphthol carries the GHS signal word "Danger". Main hazards: harmful if swallowed, harmful in contact with skin, causes skin irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 1-Naphthol?

1-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 1-Naphthol?

CompoundList lists 125 suppliers of 1-Naphthol in China, United States, India, United Kingdom and 17 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy 1-Naphthol in India?

18 suppliers in India list 1-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 1-Naphthol?

Suppliers quote 1-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 1-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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