Agrochemicals

1,3-Cyclopentadiene

Chemical Name: 1,3-Cyclopentadiene
Synonyms: Cyclopentadiene; Pentole
CAS Number: 542-92-7
Molecular Formula: C₅H₆
Molecular Weight: 66.10 g/mol

Physical and Chemical Properties

• Appearance: Colorless to pale yellow liquid
• Odor: Strong, sweet, turpentine-like
• Melting Point: -85 °C (-121 °F)
• Boiling Point: 41-42 °C (106-108 °F)
• Density: 0.80 g/cm³ (at 25 °C)
• Refractive Index: 1.444 (at 20 °C)
• Vapor Pressure: 400 mmHg (at 20 °C)
• Flash Point: -25 °C (-13 °F) (Highly flammable)
• Solubility:
  • Insoluble in water
  • Miscible with organic solvents (ethanol, ether, acetone)

Chemical Properties

• Reactivity:
  • Readily dimerizes at RT to form dicyclopentadiene (DCPD)
  • Acts as a diene in Diels-Alder reactions
  • Reacts violently with oxidizers
• Stability:
  • Requires stabilizer (e.g., hydroquinone) for storage
  • Polymerizes exothermically above 30°C

Hazard and Safety Information (GHS)

• Hazard Symbols:
  • F+ (Extremely flammable)
  • Xi (Irritant)
• Hazard Statements:
  • H225: Highly flammable liquid and vapor
  • H304: May be fatal if swallowed and enters airways
  • H315: Causes skin irritation
  • H319: Causes serious eye irritation
  • H335: May cause respiratory irritation
• Precautionary Measures:
  • P210: Keep away from heat/sparks/open flames
  • P301+P310: IF SWALLOWED: Immediately call poison center
  • P331: Do NOT induce vomiting
  • P403+P235: Store in well-ventilated place, keep cool

Storage & Handling

• Store at ≤20°C under inert atmosphere (N₂/Ar)
• Use explosion-proof refrigeration for bulk quantities
• Stabilize with 100-200 ppm hydroquinone
• Handle in fume hood with flame-proof equipment

Applications

• Key monomer for synthetic rubbers
• Precursor to cyclopentadienyl metal complexes (e.g., ferrocene)
• Essential diene for Diels-Alder reactions

Disclaimer:

The above content is for reference and communication only among industry insiders, and does not guarantee its accuracy or completeness. According to relevant laws and regulations and the regulations of this website, units or individuals who purchase related items should obtain valid qualifications and qualification conditions.