Description

Aminopyralid (CAS No. 150114-71-9) is a highly selective systemic herbicide belonging to the pyridinecarboxylic acid chemical class. With the molecular formula C₆H₄Cl₂N₂O₂ and IUPAC name 4-amino-3,6-dichloropyridine-2-carboxylic acid, this compound exhibits exceptional efficacy against broadleaf weeds, particularly in pasture, rangeland, and non-crop areas. Its unique mode of action involves mimicking natural auxins, leading to uncontrolled growth and eventual plant death. Aminopyralid is renowned for its low use rates, long-lasting residual activity, and favorable environmental profile. Available as a technical-grade material with purity ≥95%, it is ideal for formulation into commercial herbicide products. Proper handling and storage under cool, dry conditions are recommended to maintain stability.

Properties

• CAS Number: 150114-71-9
• Complexity: 190
• IUPAC Name: 4-amino-3,6-dichloro-pyridine-2-carboxylic acid
• InChI: InChI=1S/C6H4Cl2N2O2/c7-3-1-2(9)4(8)5(10-3)6(11)12/h1H,(H2,9,10)(H,11,12)
• InChI Key: NIXXQNOQHKNPEJ-UHFFFAOYSA-N
• LogP: log Kow = 0.201 ; -1.75 ; -2.87 ; -2.96
• Exact Mass: 205.9649828
• Molecular Formula: C6H4Cl2N2O2
• Molecular Weight: 207.01
• SMILES: C1=C(C(=C(N=C1Cl)C(=O)O)Cl)N
• Topological: 76.2
• Monoisotopic Mass: 205.9649828
• Color/Form: Off-white powder
• Odor: Odorless
• Melting Point: 163.5 °C
• Solubility: In acetone 29.2, ethyl acetate 4, methanol 52.2, 1,2-dichloromethane 0.189, xylene 0.043, heptane
• Density: 1.72 at 20 °C/4 °C
• Vapor Pressure: 2.59X10-5 mPa /1.92X10-10 mmHg/ at 25 °C
• Stability/Shelf Life: Stable at pH 5, 7 and 9 at 20 °C for 31 days.
• Dissociation Constants: pKa = 2.56
• Synonyms: Aminopyralid, 150114-71-9, 4-amino-3,6-dichloropyridine-2-carboxylic acid, 2-Pyridinecarboxylic acid, 4-amino-3,6-dichloro-, 4-amino-3,6-dichloro-2-pyridinecarboxylic acid, Aminopyralid [ISO], UNII-9S4EMJ60LF, 9S4EMJ60LF, CCRIS 9240, CHEBI:62962, HSDB 7939, AMINOPYRALID [MI], DTXSID2034330, MILESTONE (AMINOPYRALID HERBICIDE), DTXCID0014330, USEPA/OPP Pesticide Code: 005100, 604-721-7, nixxqnoqhknpej-uhfffaoysa-n, 4-amino-3,6-dichloropicolinic acid, MFCD08273857, SCHEMBL116082, CHEMBL1903787, AGA11471, AKOS022186420, CS-W008484, DS-8289, PB40775, NCGC00163871-01, AC-27542, SY105500, NS00004656, EN300-208837, 4-amino-3,6-dichloro-pyridine-2-carboxylic acid, Aminopyralid, PESTANAL(R), analytical standard, Q4746469

Application

Aminopyralid is widely used for selective control of invasive broadleaf weeds in grasslands, rangelands, and non-crop areas. It demonstrates exceptional activity against troublesome species such as thistles, knapweeds, and clovers while maintaining grass safety. The herbicide is particularly valued in vegetation management programs for utility rights-of-way and industrial sites. Its soil residual properties provide extended weed control, reducing the need for frequent applications.

Safety and Hazards

GHS Hazard Statements

• H318 (83.7%): Causes serious eye damage [Danger Serious eye damage/eye irritation]
• H319 (15.9%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
• H400 (29.3%): Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]
• H410 (84.1%): Very toxic to aquatic life with long lasting effects [Warning Hazardous to the aquatic environment, long-term hazard]

Precautionary Statements

• P264+P265, P273, P280, P305+P351+P338, P305+P354+P338, P317, P337+P317, P391, and P501

Hazard Classes and Categories

• Eye Dam. 1 (83.7%)
• Eye Irrit. 2A (15.9%)
• Aquatic Acute 1 (29.3%)
• Aquatic Chronic 1 (84.1%)

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