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Fragrance

2-Pentylidenecyclohexanone, when used as a fragrance ingredient

CAS 25677-40-1
55

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

A cyclohexanone with an unsaturated side chain — used for green-floral fragrance notes. The conjugated double bond makes it a Michael-acceptor electrophile that can sensitise skin; IFRA limits its use.

Skin benefits

  • Provides green, jasmine-like floral fragrance note

Known concerns

  • Alpha,beta-unsaturated ketone — Michael acceptor
  • Skin sensitisation potential
  • EU Annex III declarable allergen if listed
  • IFRA Standard restriction

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.