Triclopyr
Agrochemicals 2025-03-02
Triclopyr (CAS No. 55335-06-3)
1. Basic Information
- IUPAC Name: [(3,5,6-Trichloro-2-pyridinyl)oxy]acetic acid
- Synonyms:
- Garlon® (Dow AgroSciences trade name)
- Turflon® (for turf applications)
- CAS Number: 55335-06-3
- Molecular Formula: C₇H₄Cl₃NO₃
- Molecular Weight: 256.47 g/mol
- Appearance: White to tan crystalline solid
- Odor: Mild phenolic odor
2. Physical and Chemical Properties
| Property | Value |
|---|---|
| Melting Point | 148-150°C (298-302°F) |
| Vapor Pressure | 1.26 × 10⁻⁶ mmHg at 25°C |
| Solubility (25°C) | – Water: 440 mg/L (pH 5) |
| – Acetone: 989 g/kg | |
| Log Pow | 2.83 (octanol/water) |
| pH (1% solution) | 2.6 (acidic) |
3. Chemical Structure
Cl
|
Cl--◯-O-CH₂-COOH
|
Cl
(◯ = pyridine ring)
4. Hazards (GHS Classification)
- Acute Toxicity:
- Oral LD₅₀ (rat): 630 mg/kg (Category 3)
- Dermal LD₅₀ (rabbit): >2,000 mg/kg
- Environmental:
- Very toxic to aquatic life (H400)
- Toxic to terrestrial plants (H411)
- NFPA Rating: Health 2, Flammability 1, Reactivity 0
5. Storage and Handling
- Storage:
- Keep in original containers at <30°C
- Protect from moisture
- Handling:
- Use chemical-resistant gloves (nitrile/Viton®)
- Avoid dust generation (use local exhaust)
6. Applications
- Herbicide:
- Broadleaf weed control in forestry, turf, and non-crop areas
- Effective against woody plants (stump treatment)
- Mode of Action: Synthetic auxin herbicide
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