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Herbicides

Dacthal

Also known as Chlorthal-dimethyl, Dacthalor, Tetral

CAS 1861-32-1Formula C10H6Cl4O4Molar mass 331.97 g/molEC 217-464-7
GHS hazard pictograms. Pictograms: Hazardous to the environment 6 suppliers listed
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Dacthal chemical structure, C10H6Cl4O4, CAS 1861-32-1
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Crystals from methanol
Melting point
155 to 156
Solubility
LESS THAN 5% IN WATER, GREATER THAN 5% IN CYCLOHEXANONE, ACETONE, XYLENE
HS code
291739
Category
Herbicides
Illustrative photo, closed blue fibre drums on a pallet in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Dacthal?

Plain description, key identifiers and synonyms

Dacthal is a methyl ester and a diester.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dimethyl 2,3,5,6-tetrachlorobenzene-1,4-dicarboxylate
CAS number
1861-32-1 CAS number cross-checked
EC number
217-464-7
Molecular formula
C10H6Cl4O4
UNII
ZU3X5G2QLR
MDL number
MFCD00014902
InChIKey
NPOJQCVWMSKXDN-UHFFFAOYSA-N
InChI
InChI=1S/C10H6Cl4O4/c1-17-9(15)3-5(11)7(13)4(10(16)18-2)8(14)6(3)12/h1-2H3
SMILES (canonical and isomeric)
COC(=O)C1=C(C(=C(C(=C1Cl)Cl)C(=O)OC)Cl)Cl

Synonyms

  • Chlorthal-dimethyl
  • Dacthalor
  • Tetral
  • Fatal
  • Tetrachloroterephthalic acid dimethyl ester
  • DAC 4
  • Chlorthal dimethyl ester
  • Daktal
  • Dimethyl 2,3,5,6-tetrachlorobenzene-1,4-dicarboxylate
  • 2,3,5,6-Tetrachloroterephthalic acid dimethyl ester
  • DAC 893
  • Terephthalic acid, tetrachloro-, dimethyl ester
  • 2,3,5,6-Tetrachlorphthalsaure-dimethylester
  • Dimethylester kyseliny tetrachlortereftalove
  • TCTP
  • Dimethyl tetrachloroterephthalate
  • Chlorthal-methyl
  • Chlorthal-dimethy
  • Dimethyl 2,3,5,6-tetrachloroterephthalate
  • 1,4-Benzenedicarboxylic acid, 2,3,5,6-tetrachloro-, dimethyl ester
  • Chlorthal dimethyl
  • 1,4-Benzenedicarboxylic acid, 2,3,5,6-tetrachloro-, 1,4-dimethyl ester
  • Dimethyl 2,3,5,6-tetrachloro-1,4-benzenedicarboxylate
  • 2,3,5,6-Tetrachloro-1,4-benzenedicarboxylic acid dimethyl ester
  • DCPA (VAN)
Show all 32 synonyms
  • C10H6Cl4O4
  • methyl 2,3,5,6-tetrachloro-4-(methoxycarbonyl)benzoate
  • Chlorothal
  • Dactal
  • Chlorothal-methyl
  • Dimethyl tetrachloro-1,4-benzenedicarboxylate
  • dimethyl 2,3,5,6-tetrachloro-terephthalate

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
Crystals from methanolexp.
Odour
ESSENTIALLY ODORLESSexp.
Melting point
155 to 156exp.
Solubility
LESS THAN 5% IN WATER, GREATER THAN 5% IN CYCLOHEXANONE, ACETONE, XYLENEexp.
Vapour pressure
2.5 × 10⁻⁶ mm Hg at 25 °Cexp.

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
331.97 g/molcalc.
Exact mass
329.902 Dacalc.
LogP (octanol/water)
3.87calc.
Topological polar surface area
52.6 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
2calc.
Heavy atoms
18calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.2calc.
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 classification
Hazard pictograms
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H411Toxic to aquatic life with long lasting effects.
Precautionary statements (3)
  • P273Avoid release to the environment.
  • P391Collect spillage.
  • 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

Dacthal suppliers

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All 6 suppliers
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Where suppliers are based

6 suppliers in 3 countries

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Dacthal 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

/It is/ presently approved for use on turf, ornamentals, strawberries, and agronomic crops including cotton, soybeans, and field beans. (It is) effective against smooth & hairy crabgrass, witchgrass, green & yellow foxtails, fall panicum & other annual grasses. (It is) also useful against certain broad-leaved weeds such as carpet weed...purslane & common chickweed. (It is) tolerated by many crop plants.

It is extraordinarily toxic to dodder and has, therefore, been used for dodder control in seed alfalfa.

Selective non-systemic herbicide used for pre-emergence control of annual grasses and some annual broad-leaved weeds.

Use classes: Herbicides.

Functional uses

  • Biocide

How it is made

By esterification with methyl alcohol of tetrachloroterephthalic acid.

The ester is produced by the chlorination of terephthaloyl chloride...& reaction with methanol.

Dimethyl tetrachloroterephthalate can be prepared by chlorination of p-xylene, conversion of the resulting reaction products to 2,3,5,6-tetrachloroterephthaloyl chloride, and reaction with methanol to yield the dimethyl ester.

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

Frequently asked questions

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

What is Dacthal?

Dacthal is a methyl ester and a diester.

What is the CAS number of Dacthal?

The CAS registry number of Dacthal is 1861-32-1.

What is the molecular formula and weight of Dacthal?

The molecular formula of Dacthal is C10H6Cl4O4 and its molar mass is 331.97 g/mol.

What is Dacthal used for?

/It is/ presently approved for use on turf, ornamentals, strawberries, and agronomic crops including cotton, soybeans, and field beans. (It is) effective against smooth & hairy crabgrass, witchgrass, green & yellow foxtails, fall panicum & other annual grasses.

Is Dacthal hazardous?

Dacthal has a GHS hazard classification. Main hazards: toxic to aquatic life with long lasting effects. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Dacthal?

Dacthal 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 Dacthal?

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

What is the price of Dacthal?

Suppliers quote Dacthal 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 Dacthal

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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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