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Trichlorophenoxyacetic acid

Also known as 2,4,5-trichlorophenoxyacetic acid, 2-(2,4,5-trichlorophenoxy)acetic acid, Trioxon

CAS 93-76-5Formula C8H5Cl3O3Molar mass 255.48 g/molEC 202-273-3
GHS signal word: Warning. Pictograms: Harmful or irritant, Hazardous to the environment Controlled, licensed buyers only
Request as a licensed buyer Safety data
Trichlorophenoxyacetic acid chemical structure, C8H5Cl3O3, CAS 93-76-5
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White solid
Melting point
153 °C
Boiling point
No boiling point at normal pressure, decomposes on heating
Density
SP GR: 1.80 AT 20 °C/20 °C
Solubility
Solubility in water, g/100ml at 25 °C: 0.03
HS code
291891
Category
Herbicides
UN number
UN 2811

What is Trichlorophenoxyacetic acid?

Plain description, key identifiers and synonyms

(2,4,5-trichlorophenoxy)acetic acid is a chlorophenoxyacetic acid that is phenoxyacetic acid in which the ring hydrogens at postions 2, 4 and 5 are substituted by chlorines. It has a role as a defoliant, a synthetic auxin and a phenoxy herbicide. It is a chlorophenoxyacetic acid and a trichlorobenzene. It is a conjugate acid of a (2,4,5-trichlorophenoxy)acetate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-(2,4,5-trichlorophenoxy)acetic acid
CAS number
93-76-5 CAS number cross-checkedOther or deprecated CAS: 35915-18-5
EC number
202-273-3
Molecular formula
C8H5Cl3O3
UNII
9Q963S4YMX
MDL number
MFCD00004301
InChIKey
SMYMJHWAQXWPDB-UHFFFAOYSA-N
InChI
InChI=1S/C8H5Cl3O3/c9-4-1-6(11)7(2-5(4)10)14-3-8(12)13/h1-2H,3H2,(H,12,13)
SMILES (canonical and isomeric)
C1=C(C(=CC(=C1Cl)Cl)Cl)OCC(=O)O

Synonyms

  • 2,4,5-trichlorophenoxyacetic acid
  • 2-(2,4,5-trichlorophenoxy)acetic acid
  • Trioxon
  • Fence rider
  • BCF-Bushkiller
  • Tippontormona
  • Arbokan
  • Forron
  • Phortox
  • Reddon
  • Reddox
  • Spontox
  • Verton 2T
  • Brush Killer
  • Line rider
  • Fruitone A
  • Envert-T
  • Decamine 4T
  • Brush RHAP
  • Brushtox
  • Crossbow
  • Forst U 46
  • Tippon
  • Inverton 245
  • VEON
Show all 39 synonyms
  • Acetic acid, (2,4,5-trichlorophenoxy)-
  • Ded-weed brush killer
  • Farmco fence rider
  • Veon 245
  • Visko Rhap
  • Super D weedone
  • Lo-vol
  • Estercide t-2 and t-245
  • Debroussaillant concentre
  • Rcra waste number U232
  • T-Nox
  • Visko rhap low volatile ester
  • Debroussaillant super concentre
  • Brush-off 445 low volatile brush killer

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
White solidexp.
Odour
Odorlessexp.
Melting point
153 °Cexp.
Boiling point
No boiling point at normal pressure, decomposes on heatingexp.
Density
SP GR: 1.80 AT 20 °C/20 °Cexp.
Solubility
Solubility in water, g/100ml at 25 °C: 0.03exp.
Vapour pressure
Less than 0.01 mPa @ 20 °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
255.48 g/molcalc.
Exact mass
253.9304 Dacalc.
LogP (octanol/water)
3.11calc.
Topological polar surface area
46.53 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
3calc.
Heavy atoms
14calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.13calc.
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
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H302Harmful if swallowed.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (21)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • 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).
  • P330Rinse mouth.
  • 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.
  • 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 2811
Transport hazard class
6.1
Packing group
III

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

Trichlorophenoxyacetic acid suppliers

Controlled substance, listings of documented suppliers only, in the documented ranking

Pic

Trichlorophenoxyacetic acid is controlled. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed before suppliers see it.

Licensed buyers only, every enquiry is reviewed by our compliance team.

Reference: Rotterdam Convention Annex III prior informed consent chemical, HS 2022 subheading 2918.91 (2,4,5-trichlorophenoxyacetic acid)

Our policy on controlled substances
No documented supplier lists it yet

Licensed buyers can post a request for Trichlorophenoxyacetic acid with their licence. Our compliance team reviews it before suppliers see it.

Request as a licensed buyer

Trichlorophenoxyacetic acid 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

In March 1985 the EPA terminated all registrations for the use of this herbicide on rice fields, orchards, sugarcane, rangeland and other noncrop sites. This follows the 1970 of the Department of Agriculture halting the use of the pesticide on all food crops except rice...

2,4,5-T: U.S. Banned. (From table).

Herbicide for industrial sites, lumber yards & vacant lots, rangeland & rice, lawns & turf (incl its esters & salts), aquatic use (incl its esters & salts), home use (former use for granules), recreation areas (former use for granules), food crops for humans (former use).

Pharmacological actions

  • Herbicides

Roles

  • agonist
  • auxin
  • defoliant
  • growth regulator
  • herbicide
  • hormone
  • molecular messenger
  • pesticide
  • phenoxy herbicide
  • plant growth regulator
  • plant hormone
  • synthetic auxin
  • xenobiotic

Functional uses

  • Biocide

How it is made

The product 2,4,5-T is made by reaction of 2,4,5-trichlorophenol with monochloroacetic acid. ... The manufacture of 2,4,5-T is carried out at temp from 100 deg to 180 °C depending on the reaction medium used & the pressure employed.

Regulatory status

Inventories, regulations and trade controls that list this substance

Pic

Trichlorophenoxyacetic acid is controlled. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed before suppliers see it.

Licensed buyers only, every enquiry is reviewed by our compliance team.

Reference: Rotterdam Convention Annex III prior informed consent chemical, HS 2022 subheading 2918.91 (2,4,5-trichlorophenoxyacetic acid)

Our policy on controlled substances

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 607-041-00-9

Other lists

  • Other regulatory list

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 Trichlorophenoxyacetic acid is traded under.

HS 2918.91Exact HS code

2,4,5-T (ISO) (2,4,5-trichlorophenoxyacetic acid), its salts and esters

World exports in 2024
$484K
+13.1% vs 2023, imports $2.96M
2019 to 2024
Top exporters
  1. United States54.2%
  2. India * partner reported31.8%
  3. Netherlands10.3%
Top importers
  1. Indonesia79.9%
  2. Egypt8.7%
  3. Netherlands5.0%

* Partner reported figures, a lower bound.

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

The HS code shown for Trichlorophenoxyacetic acid is indicative (it was matched by name in the HS nomenclature). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Trichlorophenoxyacetic acid, based on the data on this page

What is Trichlorophenoxyacetic acid?

(2,4,5-trichlorophenoxy)acetic acid is a chlorophenoxyacetic acid that is phenoxyacetic acid in which the ring hydrogens at postions 2, 4 and 5 are substituted by chlorines. It has a role as a defoliant, a synthetic auxin and a phenoxy herbicide. It is a chlorophenoxyacetic acid and a trichlorobenzene.

What is the CAS number of Trichlorophenoxyacetic acid?

The CAS registry number of Trichlorophenoxyacetic acid is 93-76-5. Other or deprecated CAS numbers: 35915-18-5.

What is the molecular formula and weight of Trichlorophenoxyacetic acid?

The molecular formula of Trichlorophenoxyacetic acid is C8H5Cl3O3 and its molar mass is 255.48 g/mol.

What is Trichlorophenoxyacetic acid used for?

In March 1985 the EPA terminated all registrations for the use of this herbicide on rice fields, orchards, sugarcane, rangeland and other noncrop sites. This follows the 1970 of the Department of Agriculture halting the use of the pesticide on all food crops except rice... 2,4,5-T: U.S. Banned. (From table).

Is Trichlorophenoxyacetic acid hazardous?

Trichlorophenoxyacetic acid carries the GHS signal word "Warning". Main hazards: harmful if swallowed, 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 Trichlorophenoxyacetic acid?

Trichlorophenoxyacetic acid is usually classified under HS code 291891 (2,4,5-T (ISO) (2,4,5-trichlorophenoxyacetic acid), its salts and esters). This is indicative, confirm it with your customs broker before shipping.

Can I buy Trichlorophenoxyacetic acid on CompoundList?

Trichlorophenoxyacetic acid is a controlled substance. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed by our compliance team before suppliers see it.

Guides for buyers

Practical guides that help when you source, ship or handle Trichlorophenoxyacetic acid

Request as a licensed buyer

Upload your licence with the request. Our compliance team reviews it before the documented suppliers see it.
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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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