(E,E)-2,4-Octadien-1-Ol (CAS 18409-20-6) — Mid Note Fragrance Ingredient
(E,E)-2,4-Octadien-1-Ol
CAS 18409-20-6
What Is (E,E)-2,4-Octadien-1-Ol?
(E,E)-2,4-Octadien-1-Ol (CAS 18409-20-6) is an aroma chemical used as a fragrance and flavour ingredient. Its odour is described as green, fruity and leafy, placing it within the green family as a mid note with high volatility. With a molecular weight of 126.2 (formula C8H14O), it is handled by perfumers as a building block for compositions where a green character is desired. The data below is compiled from public chemical and regulatory sources.
Safety Profile
GENERALLY SAFE
What Does (E,E)-2,4-Octadien-1-Ol Smell Like?
The odour profile of (E,E)-2,4-Octadien-1-Ol is reported as green, fruity, leafy, sweet, apple. The dominant facet is its green character, with the remaining notes adding nuance and complexity. As a mid note it contributes to the heart 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
(E,E)-2,4-Octadien-1-Ol has the molecular formula C8H14O and a molecular weight of 126.2 g/mol. Its canonical SMILES representation is CCC\C=C\C=C\CO. Its reported log P (XLogP) of 1.89 indicates a moderately polar 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 | 126.2 g/mol |
|---|---|
| Boiling Point | 198.0 °C |
| Melting Point | 2.45 °C |
| Flash Point | 87.67 °C |
| Density | 0.8787 g/cm³ |
| Vapor Pressure | 0.06909 mmHg |
| Water Solubility | 0.01737 g/L |
| XLogP | 1.89 |
Perfumer Guide
Alternatives & Comparisons
Ingredients occupying a similar odour space — useful as substitutes or companions when (E,E)-2,4-Octadien-1-Ol is unavailable or restricted.
Shares apple, banana, fruity character — a candidate substitute or companion in the same odour space.
Shares green, leafy, apple character — a candidate substitute or companion in the same odour space.
Shares apple, fruity, green 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): 0.0012 ppb — a literature-curated value indicating its potency in the vapour phase.
Open (E,E)-2,4-Octadien-1-Ol 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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