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4-TERT-BUTYLCYCLOHEXANE CARBALDEHYDE

CAS 20691-52-5
63

Safety score · 0–100

Fine

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

About

A cycloaliphatic aldehyde fragrance with a fresh, citrus, green scent profile, classified as an EU fragrance allergen requiring declaration.

4-tert-Butylcyclohexane carbaldehyde is a cycloaliphatic aldehyde that provides fresh, citrus, and green odor notes to fragrance compositions. The branched tert-butyl group on the cyclohexane ring creates steric hindrance affecting its reactivity. It is identified in EU Regulation 1223/2009 Annex III as a fragrance allergen requiring mandatory declaration on cosmetic ingredient lists when present above threshold concentrations.

Skin benefits

  • Provides fresh, citrus-green fragrance notes
  • Used in perfumes for its aldehydic freshness
  • Blends well with floral fragrance compositions

Known concerns

  • EU declared fragrance allergen requiring label declaration
  • Potential for skin sensitization in susceptible individuals
  • Aldehyde - can react with skin proteins to form sensitizers
  • Generally safe at normal fragrance use levels

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 — always read the physical product label and consult a healthcare professional for personal concerns.