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Aromatic building blocks

Chlorthal

Also known as 2,3,5,6-Tetrachloroterephthalic acid, Tetrachloroterephthalic acid, 1,4-Benzenedicarboxylic acid, 2,3,5,6-tetrachloro-

CAS 2136-79-0Formula C8H2Cl4O4Molar mass 303.91 g/molEC 678-503-5
GHS signal word: Warning. Pictograms: Harmful or irritant 6 suppliers listed
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Chlorthal chemical structure, C8H2Cl4O4, CAS 2136-79-0
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
2136-79-0
Formula
C8H2Cl4O4
Molar mass
303.91 g/mol
EC number
678-503-5
HS code
291739
Category
Aromatic building blocks

What is Chlorthal?

Plain description, key identifiers and synonyms

Chlorthal is a 2-hydroxyisophthalic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2,3,5,6-tetrachloroterephthalic acid
CAS number
2136-79-0 CAS number cross-checked
EC number
678-503-5
Molecular formula
C8H2Cl4O4
UNII
96C2WU8832
MDL number
MFCD00013974
InChIKey
KZCBXHSWMMIEQU-UHFFFAOYSA-N
InChI
InChI=1S/C8H2Cl4O4/c9-3-1(7(13)14)4(10)6(12)2(5(3)11)8(15)16/h(H,13,14)(H,15,16)
SMILES (canonical and isomeric)
C1(=C(C(=C(C(=C1Cl)Cl)C(=O)O)Cl)Cl)C(=O)O

Synonyms

  • 2,3,5,6-Tetrachloroterephthalic acid
  • Tetrachloroterephthalic acid
  • 1,4-Benzenedicarboxylic acid, 2,3,5,6-tetrachloro-
  • Perchloroterephthalic acid
  • Terephthalic acid, tetrachloro-
  • Chlorthal (VAN)
  • 2,3,5,6-Tetrachloro-1,4-benzenedicarboxylic acid
  • tetrachlorobenzene-1,4-dicarboxylic acid
  • Terephthalic acid, tetrachloro-(8CI)
  • Chlorthal-diacid
  • 2,3,5,6-tetrachlorobenzene-1,4-dicarboxylic acid
  • 2,3,5,6-Tetrachloro-1,4-dicarboxylic acid
  • Dacthal diacid
  • tetrachloro-terephthalic acid
  • Chlorthal, BSI, ISO, WSSA
  • 2,5,6-Tetrachloroterephthalic acid
  • Terephthalic acid, tetrachloro- (8CI)
  • 2,3,5,6-Tetrachloro-1,4-dicarboxylic acid/AEI feminineEa

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
303.91 g/molcalc.
Exact mass
301.8707 Dacalc.
LogP (octanol/water)
3.7calc.
Topological polar surface area
74.6 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
2calc.
Heavy atoms
16calc.
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.
Precautionary statements (9)
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • 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.

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

Chlorthal suppliers

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

All 6 suppliers
6 of 6 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

6 suppliers in 4 countries

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Chlorthal 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

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 Chlorthal is traded under.

HS 2917.39Indicative HS code

Aromatic polycarboxylic acids, not elsewhere classified in subheading 2917.3

World exports in 2024
$1.87B
+19.8% vs 2023, imports $2.65B
2019 to 2024
Top exporters
  1. China31.7%
  2. South Korea12.9%
  3. United States9.8%
Top importers
  1. Egypt12.7%
  2. United States12.5%
  3. China10.3%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Chlorthal?

Chlorthal is a 2-hydroxyisophthalic acid.

What is the CAS number of Chlorthal?

The CAS registry number of Chlorthal is 2136-79-0.

What is the molecular formula and weight of Chlorthal?

The molecular formula of Chlorthal is C8H2Cl4O4 and its molar mass is 303.91 g/mol.

What is Chlorthal used for?

Known uses and roles of Chlorthal include building blocks in research and laboratory.

Is Chlorthal hazardous?

Chlorthal carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Chlorthal?

Chlorthal is usually classified under HS code 291739 (Aromatic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Chlorthal?

CompoundList lists 6 suppliers of Chlorthal in China, United States, Canada and Germany. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Chlorthal?

Suppliers quote Chlorthal 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 Chlorthal

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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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