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Fungicides

Chlorothalonil

Also known as Tetrachloroisophthalonitrile, Daconil, Bravo

CAS 1897-45-6Formula C8Cl4N2Molar mass 265.91 g/molEC 217-588-1
GHS signal word: Danger. Pictograms: Corrosive, Acute toxicity (severe), Serious health hazard, Hazardous to the environment 229 suppliers listed
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Chlorothalonil chemical structure, C8Cl4N2, CAS 1897-45-6
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless crystals
Melting point
252.1 °C
Boiling point
350 °C
Density
Relative density (water = 1): 1.8
Solubility
In water, 0.81 mg/L at 25 °C
HS code
292690
Category
Fungicides
UN number
UN 3276
Illustrative photo, colourless crystals in a clear glass bottle on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Chlorothalonil?

Plain description, key identifiers and synonyms

Chlorothalonil is a dinitrile that is benzene-1,3-dicarbonitrile substituted by four chloro groups. A non-systemic fungicide first introduced in the 1960s, it is used to control a range of diseases in a wide variety of crops. It has a role as an antifungal agrochemical. It is a tetrachlorobenzene, a dinitrile and an aromatic fungicide. It is functionally related to an isophthalonitrile.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2,4,5,6-tetrachlorobenzene-1,3-dicarbonitrile
CAS number
1897-45-6 CAS number cross-checked
EC number
217-588-1
Molecular formula
C8Cl4N2
UNII
J718M71A7A
MDL number
MFCD00045594
InChIKey
CRQQGFGUEAVUIL-UHFFFAOYSA-N
InChI
InChI=1S/C8Cl4N2/c9-5-3(1-13)6(10)8(12)7(11)4(5)2-14
SMILES (canonical and isomeric)
C(#N)C1=C(C(=C(C(=C1Cl)Cl)Cl)C#N)Cl

Synonyms

  • Tetrachloroisophthalonitrile
  • Daconil
  • Bravo
  • m-Tcpn
  • Nopcocide
  • Dacosoil
  • Forturf
  • Termil
  • Sweep
  • Exotherm termil
  • Daconil M
  • 1,3-Dicyanotetrachlorobenzene
  • Daconil 2787
  • meta-TCPN
  • Chloroalonil
  • Clortosip
  • Exotherm
  • Repulse
  • Faber
  • m-Tetrachlorophthalonitrile
  • 2,4,5,6-Tetrachloroisophthalonitrile
  • Tpn (pesticide)
  • 2,4,5,6-tetrachlorobenzene-1,3-dicarbonitrile
  • Bravo-W-75
  • Bravo 500
Show all 39 synonyms
  • Terraclactyl
  • 1,3-Benzenedicarbonitrile, 2,4,5,6-tetrachloro-
  • Bravo 6F
  • Nopcocide N-96
  • meta-Tetrachlorophthalodinitrile
  • Clortocaf ramato
  • Daconil Flowable
  • 2,4,5,6-Tetrachloro-1,3-benzenedicarbonitrile
  • Clorthalonil
  • Vanox
  • Nopcocide N40D & N96
  • Tetrachlorisoftalonitril
  • 2,4,5,6-Tetrachloro-3-cyanobenzonitrile
  • Isophthalonitrile, tetrachloro-

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
Colorless crystalsexp.
Odour
Odorless in pure formexp.
Melting point
252.1 °Cexp.
Boiling point
350 °Cexp.
Density
Relative density (water = 1): 1.8exp.
Solubility
In water, 0.81 mg/L at 25 °Cexp.
Vapour pressure
5.7 × 10⁻⁷ 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
265.91 g/molcalc.
Exact mass
263.8816 Dacalc.
LogP (octanol/water)
4.04calc.
Topological polar surface area
47.58 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
14calc.
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
Danger
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H317May cause an allergic skin reaction.
  • H318Causes serious eye damage.
  • H330Fatal if inhaled.
  • H335May cause respiratory irritation.
  • H351Suspected of causing cancer.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (24)
  • P203Obtain, read and follow all safety instructions before use.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3276
Transport hazard class
6.1

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

Chlorothalonil suppliers

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All 229 suppliers
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Where suppliers are based

229 suppliers in 25 countries

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Chlorothalonil 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

Fungicide, wood protectant, antimold and antimildew agent, bactericide, microbiocide, algaecide, insecticide, and acaricide.

Fungicide on a variety of vegetable crops, peanuts, lawns & turfs.

Fungicide, bactericide, nematocide. Agricultural and horticultural fungicide.

Use classes: Pesticides.

Pharmacological actions

  • Fungicides, Industrial
  • Molluscacides

Roles

  • agrochemical
  • antifungal agent
  • antifungal agrochemical
  • antimicrobial agent
  • fungicide
  • pesticide

Functional uses

  • Biocide
  • Preservative

How it is made

Chlorothalonil can be obtained by reaction of tetrachloroisophthaloyl chloride with ammonia, followed by treatment with a dehydrating agent such as phosphorus pentoxide, or by chlorination of isonaphthalonitrile.

Preparation: R. D. battershell, H. Bluestone, United States of America 3290353 (1966 to Diamond Alkali), R. M. Bimber, United States of America 3652637 (1972 to Diamond Shamrock).

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 608-014-00-4

Health and food

  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Chlorothalonil, Ref no: 1036, Annex ref: II/1036

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 Chlorothalonil is traded under.

HS 2926.90Indicative HS code

Nitrile-function compounds, other

World exports in 2024
$2.15B
−13.5% vs 2023, imports $2.17B
2019 to 2024
Top exporters
  1. China35.6%
  2. France * partner reported12.7%
  3. India * partner reported11.2%
Top importers
  1. United States13.6%
  2. China12.4%
  3. Brazil11.9%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Chlorothalonil?

Chlorothalonil is a dinitrile that is benzene-1,3-dicarbonitrile substituted by four chloro groups. A non-systemic fungicide first introduced in the 1960s, it is used to control a range of diseases in a wide variety of crops. It has a role as an antifungal agrochemical.

What is the CAS number of Chlorothalonil?

The CAS registry number of Chlorothalonil is 1897-45-6.

What is the molecular formula and weight of Chlorothalonil?

The molecular formula of Chlorothalonil is C8Cl4N2 and its molar mass is 265.91 g/mol.

What is Chlorothalonil used for?

Fungicide, wood protectant, antimold and antimildew agent, bactericide, microbiocide, algaecide, insecticide, and acaricide. Fungicide on a variety of vegetable crops, peanuts, lawns & turfs. Fungicide, bactericide, nematocide. Agricultural and horticultural fungicide. Use classes: Pesticides.

Is Chlorothalonil hazardous?

Chlorothalonil carries the GHS signal word "Danger". Main hazards: may cause an allergic skin reaction, causes serious eye damage, fatal if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Chlorothalonil?

Chlorothalonil is usually classified under HS code 292690 (Nitrile-function compounds, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Chlorothalonil?

CompoundList lists 229 suppliers of Chlorothalonil in China, Brazil, United States, India and 21 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Chlorothalonil in India?

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

What is the price of Chlorothalonil?

Suppliers quote Chlorothalonil 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 Chlorothalonil

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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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