3-Cyclopentene-1-carboxylic Acid (CAS No. 7686-77-3) 

1. Basic Information

• Chemical Name: 3-Cyclopentene-1-carboxylic acid
• Synonyms: Cyclopent-3-ene-1-carboxylic acid
• CAS Number: 7686-77-3
• Molecular Formula: C₆H₈O₂
• Molecular Weight: 112.13 g/mol
• Appearance: Colorless to pale yellow liquid or low-melting solid
• Odor: Characteristic carboxylic acid odor

2. Physical and Chemical Properties

• Melting Point: ~30-35°C (86-95°F)
• Boiling Point: ~220-225°C (428-437°F)
• Density: ~1.10 g/cm³ at 20°C
• Solubility:
  • Water: Slightly soluble
  • Organic solvents: Soluble in ethanol, ether, acetone
• Refractive Index: ~1.48 at 20°C
• pKa: ~4.5 (carboxylic acid proton)

3. Chemical Structure

      COOH
     /
    C
   / \
  C   C
  \\ /
   C

4. Hazards (GHS Classification)

• Skin Corrosion/Irritation: Causes skin irritation (H315)
• Serious Eye Damage: Causes serious eye irritation (H319)
• Environmental Hazards: Not classified
• NFPA Rating: Health 2, Flammability 1, Reactivity 0

5. Storage and Handling

• Storage:
  • Store in tightly sealed containers
  • Keep in cool, dry place away from oxidizers
• Handling:
  • Use gloves (nitrile) and eye protection
  • Work in well-ventilated area

6. Applications

• Organic Synthesis: Intermediate for pharmaceuticals and agrochemicals
• Polymer Chemistry: Monomer for specialty polymers
• Research Chemical: Used in Diels-Alder reactions

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