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Dye intermediates

4-Aminophenol

Also known as p-aminophenol, 4-hydroxyaniline, p-hydroxyaniline

CAS 123-30-8Formula C6H7NOMolar mass 109.13 g/molEC 204-616-2
GHS signal word: Warning. Pictograms: Harmful or irritant, Serious health hazard, Hazardous to the environment 133 suppliers listed Drug substance
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4-Aminophenol chemical structure, C6H7NO, CAS 123-30-8
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Orthorhombic plates from water
Melting point
187.5 ยฐC
Boiling point
284 ยฐC
Density
4-Aminophenol crystals exist in two forms. The alpha form (from alcohol, water, or ethylโ€ฆ
Flash point
195 ยฐC
HS code
292229
Category
Dye intermediates
UN number
UN 2512
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 4-Aminophenol?

Plain description, key identifiers and synonyms

4-aminophenol is an amino phenol (one of the three possible isomers) which has the single amino substituent located para to the phenolic -OH group. It has a role as a metabolite and an allergen.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-aminophenol
CAS number
123-30-8 CAS number cross-checkedOther or deprecated CAS: 25668-00-2
EC number
204-616-2
Molecular formula
C6H7NO
UNII
R7P8FRP05V
MDL number
MFCD00007869
INCI name
P-AMINOPHENOL
InChIKey
PLIKAWJENQZMHA-UHFFFAOYSA-N
InChI
InChI=1S/C6H7NO/c7-5-1-3-6(8)4-2-5/h1-4,8H,7H2
SMILES (canonical and isomeric)
C1=CC(=CC=C1N)O

Synonyms

  • p-aminophenol
  • 4-hydroxyaniline
  • p-hydroxyaniline
  • Phenol, 4-amino-
  • Paranol
  • Certinal
  • Activol
  • Citol
  • Azol
  • Rodinal
  • Ursol P Base
  • 4-aminobenzenol
  • Fouramine P
  • Benzofur P
  • p-Hydroxyphenylamine
  • Pelagol P Base
  • Ursol P
  • Fourrine P Base
  • Tertral P Base
  • UNAL
  • Pelagol Grey P Base
  • Durafur Brown RB
  • Furro P Base
  • Nako Brown R
  • Renal AC
Show all 38 synonyms
  • 4-Amino-1-hydroxybenzene
  • Fourrine 84
  • Phenol, p-amino-
  • Zoba Brown P Base
  • BASF Ursol P Base
  • 1-Amino-4-hydroxybenzene
  • C.I. Oxidation Base 6
  • p-Aminofenol
  • Para-aminophenol
  • C.I. 76550
  • 4-hydroxyphenylamine
  • CI 76550
  • 4-azaniumylphenolate

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
Orthorhombic plates from waterexp.
Melting point
187.5 ยฐCexp.
Boiling point
284 ยฐCexp.
Density
4-Aminophenol crystals exist in two forms. The alpha form (from alcohol, water, or ethyl acetate) is the more stable and has an orthorhombic pyramidal structure, density 1.290 g/cmยณ /alpha-4-Aminophenol/exp.
Flash point
195 ยฐCexp.
Solubility
Solubility in water: 0.39% at 0 ยฐC, 0.65% at 24 ยฐC, 0.80% at 30 ยฐC, in ethyl methyl ketone: 9.3% at 58.5 ยฐC, in absolute ethanol: 4.5% at 0 ยฐC, practically insoluble in benzene and chloroformexp.
Vapour pressure
4.0 ร— 10โปโต mm Hg at 25 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
109.13 g/molcalc.
Exact mass
109.0528 Dacalc.
LogP (octanol/water)
0.97calc.
Topological polar surface area
46.25 ร…ยฒcalc.
Hydrogen bond donors
2calc.
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, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 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
GHS09: Hazardous to the environment
Hazardous to the environment
140NFPA 704 rating

Hazard statements

  • H302Harmful if swallowed.
  • H332Harmful if inhaled.
  • H341Suspected of causing genetic defects.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (15)
  • P203Obtain, read and follow all safety instructions before use.
  • 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.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P330Rinse mouth.
  • P391Collect spillage.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2512

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

4-Aminophenol suppliers

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All 133 suppliers
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Where suppliers are based

133 suppliers in 23 countries

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4-Aminophenol 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

Dyeing textiles, hair, furs, feathers, photographic developer, pharmaceuticals, antioxidants, oil additives.

Intermediate in the manufacture of sulfur and azo dyes.

Chemical intermediate for the analgesic, phenacetin, and for other analgesics & antipyretics, chemical intermediate for the dyes, disperse yellow 1, acid yellow 40, and acid yellow 76.

4-Aminophenol is a strong reducing agent ... it also acts as a corrosion inhibitor in paints and as an anticorrosion-lubricating agent in 2-cycle engine fuels.

Read more

4-Aminophenol is also used as a wood stain, imparting a roselike color to timber.

Used as a chemical intermediate for the synthesis of Acid Yellow 40, Acid Yellow 76, N-benzyl-p-aminophenol hydrochloride, N-butyryl-p-aminophenol, N-(4-hydroxyphenyl)glycine, N-lauroyl-p-aminophenol, N-methyl-p-aminophenol, paracetamol, N-pelagonoyl-p-aminophenol, N-stearoyl-p-aminophenol, Sulphur Black 11, Sulphur Green 1, Sulphur Green 9, Sulphur Green 11, Sulphur Red 10, triglycidyl-p-aminophenol.

Industrial uses: Other, Intermediate, Adhesion/cohesion promoter.

Consumer uses: Adhesion/cohesion promoter, Intermediate.

Use classes: Cosmetics, Pesticide transformation products.

Cosmetic ingredient, INCI name P-AMINOPHENOL(hair dyeing)

Pharmacological actions

  • Mutagens

Roles

  • aetiopathogenetic role
  • allergen
  • metabolite

Functional uses

  • Dye

Cosmetic functions

  • Hair dyeing

How it is made

Reduction of nitrobenzene with iron filings in acid or by catalytic hydrogenation

Usually prepared by the reduction of p-nitrophenol

(1) By reduction of p-nitrophenol with iron filings and hydrochloric acid, (2) by electrolytic reduction of nitrobenzene in concentrated sulfuric acid and treatment with an alkali to free the base.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 612-128-00-X

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex III, restricted in cosmetics
    Name: P-AMINOPHENOL, Ref no: 272, Annex ref: III/272
  • Active ingredient in FDA approved drug labels

United States

  • TSCA inventory (USA)
    Status: Active in US commerce, Regulatory flags: Proposed section 4 test rule

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code 4-Aminophenol is traded under.

HS 2922.29Indicative HS code

Amino-naphthols and other amino-phenols, other than those containing more than one kindโ€ฆ

World exports in 2024
$467M
โˆ’15.3% vs 2023, imports $454M
2019 to 2024
Top exporters
  1. China63.1%
  2. India * partner reported15.5%
  3. Japan4.0%
Top importers
  1. India * partner reported25.8%
  2. United States14.4%
  3. South Korea7.6%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is 4-Aminophenol?

4-aminophenol is an amino phenol (one of the three possible isomers) which has the single amino substituent located para to the phenolic -OH group. It has a role as a metabolite and an allergen.

What is the CAS number of 4-Aminophenol?

The CAS registry number of 4-Aminophenol is 123-30-8. Other or deprecated CAS numbers: 25668-00-2.

What is the molecular formula and weight of 4-Aminophenol?

The molecular formula of 4-Aminophenol is C6H7NO and its molar mass is 109.13 g/mol.

What is 4-Aminophenol used for?

Dyeing textiles, hair, furs, feathers, photographic developer, pharmaceuticals, antioxidants, oil additives. Intermediate in the manufacture of sulfur and azo dyes.

Is 4-Aminophenol hazardous?

4-Aminophenol carries the GHS signal word "Warning". Main hazards: harmful if swallowed, harmful if inhaled, suspected of causing genetic defects. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of 4-Aminophenol?

4-Aminophenol is usually classified under HS code 292229 (Amino-naphthols and other amino-phenols, other than those containing more than one kindโ€ฆ). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 4-Aminophenol?

CompoundList lists 133 suppliers of 4-Aminophenol in China, United States, India, Germany and 19 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy 4-Aminophenol in India?

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

What is the price of 4-Aminophenol?

Suppliers quote 4-Aminophenol 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 4-Aminophenol

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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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