Agrochemicals

Propachlor

Chemical Name: 2-Chloro-N-(1-methylethyl)-N-phenylacetamide
Synonyms: Albrass; CP 31393
CAS Number: 1918-16-7
Molecular Formula: C₁₁H₁₄ClNO
Molecular Weight: 211.69 g/mol

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Physical & Chemical Properties

Property	Specification
Appearance	White to tan crystalline solid
Odor	Slightly pungent
Melting Point	67-76°C (153-169°F)
Boiling Point	110°C (230°F) at 0.03 mmHg
Vapor Pressure	1.2 × 10⁻⁴ mmHg (25°C)
Solubility	Water: 580 mg/L (20°C); soluble in acetone, ethanol
Partition Coefficient (log P<sub>ow</sub>)	2.18

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Hazard & Safety Information (GHS)

Warning Symbols:
⚠️ Acute Toxicity (Category 4)
⚠️ Environmental Hazard (Category 2)

Hazard Codes:
• H302: Harmful if swallowed
• H317: May cause allergic skin reaction
• H410: Very toxic to aquatic life with long-lasting effects

Precautionary Measures:
• P273: Avoid release to the environment
• P280: Wear protective gloves/clothing
• P301+P312: IF SWALLOWED: Call a poison center

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Chemical Behavior

• Stability:

• Stable under normal conditions
• Hydrolyzes slowly in alkaline conditions
  • Photolysis: Degrades under UV light

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Applications

✔ Herbicide:

• Pre-emergence control of annual grasses/broadleaf weeds in corn, soybeans
  ✔ Mode of Action:
• Inhibits cell division (microtubule assembly disruptor)

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