cis-9-Octadecenyl Acetate (CAS 693-80-1) — Base Note Fragrance Ingredient
cis-9-Octadecenyl Acetate
CAS 693-80-1
What Is cis-9-Octadecenyl Acetate?
cis-9-Octadecenyl Acetate (CAS 693-80-1) is an aroma chemical used as a fragrance and flavour ingredient. Its odour is described as citrus, fruity and rose, placing it within the fruity family as a base note with low volatility. With a molecular weight of 310.5 (formula C20H38O2), it is handled by perfumers as a building block for compositions where a citrus character is desired. The data below is compiled from public chemical and regulatory sources.
Safety Profile
GENERALLY SAFE
What Does cis-9-Octadecenyl Acetate Smell Like?
The odour profile of cis-9-Octadecenyl Acetate is reported as citrus, fruity, rose, floral, green, orange. The dominant facet is its citrus character, with the remaining notes adding nuance and complexity. As a base note it contributes to the dry-down of a fragrance. Perceived intensity and exact character depend on concentration, the carrier and the surrounding accord.
Scent Profile
Profile derived from public odour-descriptor data; relative, not absolute.
Chemistry & Properties
The Chemistry
cis-9-Octadecenyl Acetate has the molecular formula C20H38O2 and a molecular weight of 310.5 g/mol. Its canonical SMILES representation is CCCCCCCC\C=C/CCCCCCCCOC(C)=O. Its reported log P (XLogP) of 6.59 indicates a lipophilic, oil-soluble molecule, which informs how it partitions in a formula. Physical constants below are drawn from PubChem and EPA CompTox public datasets.
Physical & Chemical Properties
| Molecular Weight | 310.5 g/mol |
|---|---|
| Boiling Point | 367.3 °C |
| Melting Point | -12.83 °C |
| Flash Point | 129.4 °C |
| Density | 0.816 g/cm³ |
| Vapor Pressure | 5.094e-06 mmHg |
| Water Solubility | 4.786e-06 g/L |
| XLogP | 6.59 |
Perfumer Guide
Alternatives & Comparisons
Ingredients occupying a similar odour space — useful as substitutes or companions when cis-9-Octadecenyl Acetate is unavailable or restricted.
Shares floral, fruity, green character — a candidate substitute or companion in the same odour space.
Shares citrus, fatty, floral character — a candidate substitute or companion in the same odour space.
Shares aldehydic, floral, fresh character — a candidate substitute or companion in the same odour space.
Safety & Regulatory
⚠ Regulatory Disclaimer
General reference only. IFRA, REACH and EU Cosmetics Regulation standards update periodically. Consult the current IFRA Standards Library before formulating. Not legal or regulatory advice.
IFRA Status
No IFRA restriction recorded in the data set. This is not a guarantee of unrestricted status — always confirm against the current IFRA Standards Library.
Odour detection threshold (air): 4.173e-06 ppb — a literature-curated value indicating its potency in the vapour phase.
Open cis-9-Octadecenyl Acetate in Fragrance Studio (Pro) for the calibrated vapour-pressure curve, the modelled odour-threshold estimate, and the substitute-matching engine across 2,900+ aromachemicals.
References & Sources
- PubChem Compound Summary (NIH) — search by InChIKey
- EPA CompTox Chemicals Dashboard — physicochemical & fate data
- IFRA Standards Library (49th / 51st Amendment)
Data: PubChem (NIH), EPA CompTox, IFRA. Last reviewed: Jun 2026.
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