Metribuzin

Metribuzin (CAS No. 21087-64-9) 

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1. Basic Information

IUPAC Name: 4-Amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-oneSynonyms:Sencor® (Bayer trade name)Lexone® (DuPont trade name)CAS Number: 21087-64-9Molecular Formula: C₈H₁₄N₄OSMolecular Weight: 214.29 g/molAppearance: White to off-white crystalline powderOdor: Slight sulfurous odor

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2. Physical and Chemical Properties

Property	Value
Melting Point	125–126.5°C (257–260°F)
Vapor Pressure	0.058 mPa (25°C)
Solubility (25°C)	– Water: 1,050 mg/L (pH 7)
	– Acetone: 820 g/kg
Log Pow	1.65 (octanol/water)
Stability	Hydrolytically stable (pH 5–9)

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3. Chemical Structure

      O        ║    CH₃-S-C-NH        |   ║    (CH₃)₃C-N=N

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4. Hazards (GHS Classification)

Acute Toxicity:Oral LD₅₀ (rat): 1,100–2,300 mg/kg (Category 4)Dermal LD₅₀ (rabbit): >20,000 mg/kgEnvironmental:Toxic to aquatic life (H411)Very 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 moisture and direct sunlightHandling:Use chemical-resistant gloves (nitrile/Viton®)Avoid dust generation (use local exhaust)

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6. Applications

Herbicide:Selective control of broadleaf weeds in soybeans, potatoes, and cerealsApplied pre- and post-emergence (0.25–1.0 kg a.i./ha)Mode of Action: Photosystem II inhibitor (triazine group)

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