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Indicators and stains

Pyrocatechol violet

Also known as 1,2-Benzenediol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis-, Catechol violet, Pyrocatechinsulfonephthalein

CAS 115-41-3Formula C19H14O7SMolar mass 386.38 g/molEC 204-088-3
GHS signal word: Warning. Pictograms: Harmful or irritant 10 suppliers listed
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Pyrocatechol violet chemical structure, C19H14O7S, CAS 115-41-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
115-41-3
Formula
C19H14O7S
Molar mass
386.38 g/mol
EC number
204-088-3
HS code
293499
Category
Indicators and stains

What is Pyrocatechol violet?

Plain description, key identifiers and synonyms

Pyrocatechol violet is a chemical substance with the molecular formula C19H14O7S and a molar mass of 386.38 g/mol. Its CAS registry number is 115-41-3. The IUPAC name is 4-[3-(3,4-dihydroxyphenyl)-1,1-dioxo-2,1ฮป6-benzoxathiol-3-yl]benzene-1,2-diol.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-[3-(3,4-dihydroxyphenyl)-1,1-dioxo-2,1ฮป6-benzoxathiol-3-yl]benzene-1,2-diol
CAS number
115-41-3 CAS number cross-checked
EC numbers
204-088-3, 680-592-0
Molecular formula
C19H14O7S
MDL number
MFCD00005868
InChIKey
RRRCKIRSVQAAAS-UHFFFAOYSA-N
InChI
InChI=1S/C19H14O7S/c20-14-7-5-11(9-16(14)22)19(12-6-8-15(21)17(23)10-12)13-3-1-2-4-18(13)27(24,25)26-19/h1-10,20-23H
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C(OS2(=O)=O)(C3=CC(=C(C=C3)O)O)C4=CC(=C(C=C4)O)O

Synonyms

  • 1,2-Benzenediol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis-
  • Catechol violet
  • Pyrocatechinsulfonephthalein
  • Pyrocatecholsulfonphthalein
  • Pyrocatechol sulfonphthalein
  • 4-[3-(3,4-dihydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]benzene-1,2-diol
  • PKF
  • 3,3-bis(3,4-dihydroxyphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxide
  • 4,4'-(1,1-Dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[1,2-benzenediol]
  • Catechol violet indicator
  • 3H-2,1-Benzoxathiole, 3,3-bis(3,4-dihydroxyphenyl)-, 1,1-dioxide
  • 1,2-Benzenediol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis-, S,S-dioxide
  • 4-[3-(3,4-dihydroxyphenyl)-1,1-dioxo-2,1$l^{6}-benzoxathiol-3-yl]benzene-1,2-diol
  • 3H-2, 3,3-bis(3,4-dihydroxyphenyl)-, 1,1-dioxide
  • 1, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis-, S,S-dioxide
  • Pyrocatechol,4'-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide
  • 3,3-Bis(3,4-dihydroxyphenyl)-2,1lambda~6~-benzoxathiole-1,1(3H)-dione
  • Pyrocatechol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide
  • 4,4 inverted exclamation marka-(1,1-Dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[1,2-benzenediol]

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
386.38 g/molcalc.
Exact mass
386.046 Dacalc.
LogP (octanol/water)
2.52calc.
Topological polar surface area
124.3 ร…ยฒcalc.
Hydrogen bond donors
4calc.
Hydrogen bond acceptors
7calc.
Rotatable bonds
2calc.
Heavy atoms
27calc.
Rings
4calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.05calc.
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=S1(=O)OC(c2ccccc2)(c2ccccc2)c2ccccc21

O=S1(=O)OC(c2ccccc2)(c2ccccc2)c2ccccc21

4 rings, 23 atoms, the 3,3-Diphenyl-3H-benzo[c][1,2]oxathiole 1,1-dioxide ring system.

63 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

Pyrocatechol violet suppliers

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Where suppliers are based

10 suppliers in 3 countries

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Pyrocatechol violet 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

Regulatory status

Inventories, regulations and trade controls that list this substance

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 Pyrocatechol violet is traded under.

HS 2934.99Indicative HS code

Nucleic acids and their salts, other heterocyclic compounds, not elsewhere classified in heading 2934

World exports in 2024
$26.7B
+15.0% vs 2023, imports $26.3B
2019 to 2024
Top exporters
  1. Ireland26.3%
  2. China15.7%
  3. Singapore10.3%
Top importers
  1. United States24.5%
  2. Germany23.1%
  3. Japan4.5%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Pyrocatechol violet, based on the data on this page

What is Pyrocatechol violet?

Pyrocatechol violet is a chemical substance with the molecular formula C19H14O7S and a molar mass of 386.38 g/mol. Its CAS registry number is 115-41-3. The IUPAC name is 4-[3-(3,4-dihydroxyphenyl)-1,1-dioxo-2,1ฮป6-benzoxathiol-3-yl]benzene-1,2-diol.

What is the CAS number of Pyrocatechol violet?

The CAS registry number of Pyrocatechol violet is 115-41-3.

What is the molecular formula and weight of Pyrocatechol violet?

The molecular formula of Pyrocatechol violet is C19H14O7S and its molar mass is 386.38 g/mol.

What is Pyrocatechol violet used for?

Known uses and roles of Pyrocatechol violet include indicators and stains in research and laboratory.

Is Pyrocatechol violet hazardous?

Pyrocatechol violet 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 Pyrocatechol violet?

Pyrocatechol violet is usually classified under HS code 293499 (Nucleic acids and their salts, whether or not chemically defined, other heterocyclicโ€ฆ). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Pyrocatechol violet?

CompoundList lists 10 suppliers of Pyrocatechol violet in India, United Arab Emirates and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Pyrocatechol violet in India?

5 suppliers in India list Pyrocatechol violet on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Pyrocatechol violet?

Suppliers quote Pyrocatechol violet 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

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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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