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Herbicides

Picloram

Also known as 4-Amino-3,5,6-trichloropyridine-2-carboxylic acid, 4-Amino-3,5,6-trichloropicolinic acid, Tordon

CAS 1918-02-1Formula C6H3Cl3N2O2Molar mass 241.46 g/molEC 217-636-1
GHS signal word: Warning. Pictograms: Harmful or irritant, Hazardous to the environment 136 suppliers listed
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Picloram chemical structure, C6H3Cl3N2O2, CAS 1918-02-1
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White powder
Melting point
218.5 °C
Boiling point
Decomposes
Flash point
46 °C
Solubility
In water, 430 mg/L at 25 °C
HS code
293339
Category
Herbicides
Illustrative photo, 25 kg white woven sacks of powder on a pallet in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Picloram?

Plain description, key identifiers and synonyms

Picloram is a pyridinemonocarboxylic acid that is pyridine-2-carboxylic acid which is substituted by a chloro group at positions 3,5 and 6, and by an amino group at position 4. It is a systemic herbicide used to control deeply rooted herbaceous weeds and woody plants in rights-of-way, forestry, range lands, pastures, and small grain crops. It has a role as a herbicide and a synthetic auxin. It is a pyridinemonocarboxylic acid, an aminopyridine, an organochlorine pesticide and a chloropyridine. It is functionally related to a picolinic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-amino-3,5,6-trichloropyridine-2-carboxylic acid
CAS number
1918-02-1 CAS number cross-checked
EC number
217-636-1
Molecular formula
C6H3Cl3N2O2
UNII
O7437X49DW
MDL number
MFCD00012101
InChIKey
NQQVFXUMIDALNH-UHFFFAOYSA-N
InChI
InChI=1S/C6H3Cl3N2O2/c7-1-3(10)2(8)5(9)11-4(1)6(12)13/h(H2,10,11)(H,12,13)
SMILES (canonical and isomeric)
C1(=C(C(=NC(=C1Cl)Cl)C(=O)O)Cl)N

Synonyms

  • 4-Amino-3,5,6-trichloropyridine-2-carboxylic acid
  • 4-Amino-3,5,6-trichloropicolinic acid
  • Tordon
  • Borolin
  • Amdon
  • K-Pin
  • 2-Pyridinecarboxylic acid, 4-amino-3,5,6-trichloro-
  • Grazon
  • ATCP
  • Tordon 22K
  • Piclorame
  • Tordon 10K
  • Amdon grazon
  • 4-Aminotrichloropicolinic acid
  • 4-Amino-3,5,6-trichloro-2-pyridinecarboxylic acid
  • 3,5,6-Trichloro-4-aminopicolinic acid
  • 4-Amino-3,5,6-trichloro-2-picolinic acid
  • Picolinic acid, 4-amino-3,5,6-trichloro-
  • 4-Amino-3,5,6-trichlorpicolinsaeure
  • Chloramp
  • Picloram, technical grade
  • 4-amino-3,5,6-trichloro-pyridine-2-carboxylic acid
  • Access
  • Grazon PC
  • Piclorame [ISO-French]
Show all 32 synonyms
  • Pathway
  • Padron
  • picloram acid
  • Tordon10K
  • Picloram (Standard)
  • Chloramp (Salt/Mix)
  • 3,5,6-trichloro-4-amino-2-pyridinecarboxylic acid

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 powderexp.
Odour
Chlorine-like odorexp.
Melting point
218.5 °Cexp.
Boiling point
Decomposesexp.
Flash point
46 °Cexp.
Solubility
In water, 430 mg/L at 25 °Cexp.
Vapour pressure
6.0 × 10⁻¹⁶ 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
241.46 g/molcalc.
Exact mass
239.926 Dacalc.
LogP (octanol/water)
2.32calc.
Topological polar surface area
76.21 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
1calc.
Heavy atoms
13calc.
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, c1ccncc1

c1ccncc1

1 ring, 6 atoms, the Pyridine ring system.

118,162 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

  • H319Causes serious eye irritation.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
  • H412Harmful to aquatic life with long lasting effects.
Precautionary statements (7)
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P337 + P317If eye irritation persists: Get medical help.
  • 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

Picloram suppliers

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

All 136 suppliers
30 of 30 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

136 suppliers in 22 countries

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Picloram 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

Herbicide.

For deep-rooted broadleaf weeds and woody plants. Most grasses are resistant. Non-crop use in brush control along utility rights-of-way on forest sites, for weed and brush control in pastures and rangeland, and broadleaf weed control in small grains.

An herbicide used as a defoliant in forest warfare.

Use classes: Herbicides.

Pharmacological actions

  • Herbicides

Roles

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

Functional uses

  • Biocide

How it is made

Produced by chlorination of 2-methylpyridine, hydrolysis and reaction with ammonia ...

Picloram is produced from alpha-picoline by chlorination, followed by hydrolysis of the alpha-trichloropicoline derivative, and amidation.

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 Picloram is traded under.

HS 2933.39Indicative HS code

Heterocyclic compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure…

World exports in 2024
$9.16B
−17.9% vs 2023, imports $10.6B
2019 to 2024
Top exporters
  1. China21.5%
  2. India * partner reported12.3%
  3. Ireland11.6%
Top importers
  1. Germany14.2%
  2. United States12.8%
  3. Brazil10.1%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Picloram?

Picloram is a pyridinemonocarboxylic acid that is pyridine-2-carboxylic acid which is substituted by a chloro group at positions 3,5 and 6, and by an amino group at position 4.

What is the CAS number of Picloram?

The CAS registry number of Picloram is 1918-02-1.

What is the molecular formula and weight of Picloram?

The molecular formula of Picloram is C6H3Cl3N2O2 and its molar mass is 241.46 g/mol.

What is Picloram used for?

Herbicide. For deep-rooted broadleaf weeds and woody plants. Most grasses are resistant. Non-crop use in brush control along utility rights-of-way on forest sites, for weed and brush control in pastures and rangeland, and broadleaf weed control in small grains. An herbicide used as a defoliant in forest warfare.

Is Picloram hazardous?

Picloram carries the GHS signal word "Warning". Main hazards: causes serious eye irritation, very toxic to aquatic life, very 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 Picloram?

Picloram is usually classified under HS code 293339 (Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Picloram?

CompoundList lists 136 suppliers of Picloram in Brazil, China, United States, India and 18 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Picloram in India?

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

What is the price of Picloram?

Suppliers quote Picloram 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 Picloram

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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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