Chemical Name: 3,7-Dimethyloct-6-en-1-al
Common Name: Citronellal
Molecular Formula: C₁₀H₁₈O
Molecular Weight: 154.25 g/mol
CAS Number: 106-23-0
Appearance: Colorless to pale yellow liquid
Odor: Fresh, lemony, slightly floral, citronella-like
Boiling Point: ~206°C (403°F)
Flash Point: ~76°C (169°F)
Solubility: Insoluble in water; soluble in alcohol and oils
Functional Group: Aliphatic aldehyde (monoterpenoid)
Perfumery Profile
Scent Profile:
- Lemony and fresh, slightly green and rosy
- Has a distinct citronella or lemongrass character
- Mildly soapy and clean
Use in Perfumery:
- Adds bright citrus freshness to top notes
- Common in fresh, herbal, citrus, and green compositions
- Used in both fine fragrance and functional products (like soaps, detergents, and air fresheners)
- Blends well with florals, herbals, and woody materials
Fragrance Families:
- Citrus
- Green
- Herbal
- Floral
Natural Source:
- Occurs naturally in citronella oil, lemongrass oil, eucalyptus, and rose geranium
- Commercial citronellal is often derived from citronellol or citronella oil
Notable Uses:
- Found in perfumes requiring a fresh, lemony top
- Also used as an insect repellent due to its presence in citronella oil