Triclopyr

Triclopyr (CAS No. 55335-06-3) 

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1. Basic Information

IUPAC Name: [(3,5,6-Trichloro-2-pyridinyl)oxy]acetic acidSynonyms:Garlon® (Dow AgroSciences trade name)Turflon® (for turf applications)CAS Number: 55335-06-3Molecular Formula: C₇H₄Cl₃NO₃Molecular Weight: 256.47 g/molAppearance: White to tan crystalline solidOdor: Mild phenolic odor

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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)

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3. Chemical Structure

      Cl       |  Cl--◯-O-CH₂-COOH       |      Cl

(◯ = pyridine ring)

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4. Hazards (GHS Classification)

Acute Toxicity:Oral LD₅₀ (rat): 630 mg/kg (Category 3)Dermal LD₅₀ (rabbit): >2,000 mg/kgEnvironmental:Very toxic to aquatic life (H400)Toxic to terrestrial plants (H411)NFPA Rating: Health 2, Flammability 1, Reactivity 0

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5. Storage and Handling

Storage:Keep in original containers at <30°CProtect from moistureHandling:Use chemical-resistant gloves (nitrile/Viton®)Avoid dust generation (use local exhaust)

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6. Applications

Herbicide:Broadleaf weed control in forestry, turf, and non-crop areasEffective against woody plants (stump treatment)Mode of Action: Synthetic auxin herbicide

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