(E)-2-Nonenoic Acid (CAS 14812-03-4) — Mid Note Fragrance Ingredient
(E)-2-Nonenoic Acid
CAS 14812-03-4
What Is (E)-2-Nonenoic Acid?
(E)-2-Nonenoic Acid (CAS 14812-03-4) is an aroma chemical used as a fragrance and flavour ingredient. Its odour is described as fatty, sweet and green, placing it as a mid note with low volatility. With a molecular weight of 156.2 (formula C9H16O2), it is handled by perfumers as a building block for compositions where a fatty character is desired. The data below is compiled from public chemical and regulatory sources.
Safety Profile
USE WITH AWARENESS
What Does (E)-2-Nonenoic Acid Smell Like?
The odour profile of (E)-2-Nonenoic Acid is reported as fatty, sweet, green, waxy, pear, fruity. The dominant facet is its fatty 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)-2-Nonenoic Acid has the molecular formula C9H16O2 and a molecular weight of 156.2 g/mol. Its canonical SMILES representation is CCCCCC\C=C\C(O)=O. Its reported log P (XLogP) of 2.60 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 | 156.2 g/mol |
|---|---|
| Boiling Point | 261.5 °C |
| Melting Point | 21.52 °C |
| Flash Point | 150.0 °C |
| Density | 0.935 g/cm³ |
| Vapor Pressure | 0.001413 mmHg |
| Water Solubility | 0.003099 g/L |
| XLogP | 2.60 |
Perfumer Guide
Alternatives & Comparisons
Ingredients occupying a similar odour space — useful as substitutes or companions when (E)-2-Nonenoic Acid is unavailable or restricted.
Shares fatty, fruity, green character — a candidate substitute or companion in the same odour space.
Shares fatty, fruity, green character — a candidate substitute or companion in the same odour space.
Shares fatty, 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.
GHS Classification
Signal word: Danger
Odour detection threshold (air): 3.6e-08 ppb — a literature-curated value indicating its potency in the vapour phase.
Open (E)-2-Nonenoic Acid 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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