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Sulfur and phosphorus compounds

4-Mercaptophenol

Also known as 4-Hydroxythiophenol, 4-Hydroxybenzenethiol, p-Mercaptophenol

CAS 637-89-8Formula C6H6OSMolar mass 126.18 g/molEC 211-307-6
GHS signal word: Warning. Pictograms: Harmful or irritant 7 suppliers listed
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4-Mercaptophenol chemical structure, C6H6OS, CAS 637-89-8
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
637-89-8
Formula
C6H6OS
Molar mass
126.18 g/mol
EC number
211-307-6
HS code
293090
Category
Sulfur and phosphorus compounds

What is 4-Mercaptophenol?

Plain description, key identifiers and synonyms

4-Mercaptophenol is a chemical substance with the molecular formula C6H6OS and a molar mass of 126.18 g/mol. Its CAS registry number is 637-89-8. The IUPAC name is 4-sulfanylphenol.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-sulfanylphenol
CAS number
637-89-8 CAS number cross-checked
EC number
211-307-6
Molecular formula
C6H6OS
UNII
TAL4TS4AC3
MDL number
MFCD00004850
InChIKey
BXAVKNRWVKUTLY-UHFFFAOYSA-N
InChI
InChI=1S/C6H6OS/c7-5-1-3-6(8)4-2-5/h1-4,7-8H
SMILES (canonical and isomeric)
C1=CC(=CC=C1O)S

Synonyms

  • 4-Hydroxythiophenol
  • 4-Hydroxybenzenethiol
  • p-Mercaptophenol
  • Phenol, 4-mercapto-
  • Monothiohydroquinone
  • Phenol, p-mercapto-
  • Hydroquinone, monothio-
  • 4-Sulfanylphenol
  • p-Hydroxythiophenol
  • Thiohydroquinone
  • 4-Hydroxy Thiophenol
  • USAF B-57
  • p-hydroxybenzenethiol
  • 4-mercapto-phenol
  • 4-mercapto phenol
  • 4-hydroxy-thiophenol
  • 4-Sulfanylphenol #
  • para-hydroxy thiophenol
  • 4-Mercaptophenol, 97%
  • Bxavknrwvkutly-uhfffaoysa-
  • 4-Mercaptophenol, technical grade, 90%
  • 4-Mercaptophenol, Vetec(TM) reagent grade, 89%
  • HTU

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
126.18 g/molcalc.
Exact mass
126.0139 Dacalc.
LogP (octanol/water)
1.68calc.
Topological polar surface area
20.23 Ųcalc.
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

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

4-Mercaptophenol suppliers

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

All 7 suppliers
7 of 7 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

7 suppliers in 5 countries

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4-Mercaptophenol 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 4-Mercaptophenol is traded under.

HS 2930.90Indicative HS code

Organo-sulphur compounds, other

World exports in 2024
$5.83B
+0.1% vs 2023, imports $5.93B
2019 to 2024
Top exporters
  1. China40.7%
  2. United States10.9%
  3. Japan9.3%
Top importers
  1. United States13.3%
  2. Brazil12.6%
  3. China6.6%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is 4-Mercaptophenol?

4-Mercaptophenol is a chemical substance with the molecular formula C6H6OS and a molar mass of 126.18 g/mol. Its CAS registry number is 637-89-8. The IUPAC name is 4-sulfanylphenol.

What is the CAS number of 4-Mercaptophenol?

The CAS registry number of 4-Mercaptophenol is 637-89-8.

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

The molecular formula of 4-Mercaptophenol is C6H6OS and its molar mass is 126.18 g/mol.

What is 4-Mercaptophenol used for?

Known uses and roles of 4-Mercaptophenol include building blocks in research and laboratory and screening compounds in research and laboratory.

Is 4-Mercaptophenol hazardous?

4-Mercaptophenol 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 4-Mercaptophenol?

4-Mercaptophenol is usually classified under HS code 293090 (Organo-sulphur compounds, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy 4-Mercaptophenol?

CompoundList lists 7 suppliers of 4-Mercaptophenol in China, United States, Canada, United Kingdom and 1 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 4-Mercaptophenol?

Suppliers quote 4-Mercaptophenol 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-Mercaptophenol

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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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