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Impurities and reference standards

Thioxanthone

Also known as Thioxanthen-9-one, 9H-Thioxanthen-9-one, 9-Thioxanthone

CAS 492-22-8Formula C13H8OSMolar mass 212.27 g/molEC 207-749-4
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Thioxanthone chemical structure, C13H8OS, CAS 492-22-8
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
492-22-8
Formula
C13H8OS
Molar mass
212.27 g/mol
EC number
207-749-4
HS code
293499
Category
Impurities and reference standards

What is Thioxanthone?

Plain description, key identifiers and synonyms

Thioxanthone is a chemical substance with the molecular formula C13H8OS and a molar mass of 212.27 g/mol. Its CAS registry number is 492-22-8. The IUPAC name is thioxanthen-9-one.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
thioxanthen-9-one
CAS number
492-22-8 CAS number cross-checked
EC number
207-749-4
Molecular formula
C13H8OS
UNII
EOK1SAC304
MDL number
MFCD00005066
InChIKey
YRHRIQCWCFGUEQ-UHFFFAOYSA-N
InChI
InChI=1S/C13H8OS/c14-13-9-5-1-3-7-11(9)15-12-8-4-2-6-10(12)13/h1-8H
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C(=O)C3=CC=CC=C3S2

Synonyms

  • Thioxanthen-9-one
  • 9H-Thioxanthen-9-one
  • 9-Thioxanthone
  • Thiaxanthenone
  • Thioxanthenone
  • Thiaxanthon
  • 9H-Thioxanthene, 9-oxo-
  • Thiaxanthone
  • Thioxanthene-9-one
  • 9-Oxothioxanthene
  • 10-Thioxanthone
  • Thioxanthene, 9-oxo-
  • 9-Oxothioxanthene,Thioxanthone
  • Metixene Hydrochloride EP Impurity B
  • dibenzo[b,e]thiin-10-one
  • 9H-Thioxanthen-9-one (Thioxanthone)
  • Thioxanthone CRS
  • 9H-Thioxanthen-9-one, Metixene Hydrochloride Imp. B (EP), Thioxanthone, Metixene Hydrochloride Impurity B, Metixene Impurity B
  • Thioxanthen-9-one, 97%
  • Thioxanthone, 9-Oxothioxanthene
  • Thioxanthone, purum, >=97.0% (HPLC)
  • doi:10.14272/YRHRIQCWCFGUEQ-UHFFFAOYSA-N.1
  • Thioxanthone, European Pharmacopoeia (EP) Reference Standard

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
212.27 g/molcalc.
Exact mass
212.0296 Dacalc.
LogP (octanol/water)
3.41calc.
Topological polar surface area
17.07 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
15calc.
Rings
3calc.
Aromatic rings
3calc.
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, O=c1c2ccccc2sc2ccccc12

O=c1c2ccccc2sc2ccccc12

3 rings, 15 atoms. This chemical is the scaffold itself.

254 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Thioxanthone suppliers

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

All 20 suppliers
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Where suppliers are based

20 suppliers in 5 countries

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Thioxanthone price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

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 Thioxanthone 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 Thioxanthone is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Thioxanthone, based on the data on this page

What is Thioxanthone?

Thioxanthone is a chemical substance with the molecular formula C13H8OS and a molar mass of 212.27 g/mol. Its CAS registry number is 492-22-8. The IUPAC name is thioxanthen-9-one.

What is the CAS number of Thioxanthone?

The CAS registry number of Thioxanthone is 492-22-8.

What is the molecular formula and weight of Thioxanthone?

The molecular formula of Thioxanthone is C13H8OS and its molar mass is 212.27 g/mol.

Is Thioxanthone hazardous?

No GHS hazard classification for Thioxanthone is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Thioxanthone?

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

Where can I buy Thioxanthone?

CompoundList lists 20 suppliers of Thioxanthone in China, United States, Switzerland, Czech Republic 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 Thioxanthone?

Suppliers quote Thioxanthone 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 Thioxanthone

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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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