cis-3-Hexenoic Acid (CAS 1775-43-5) — Mid Note Fragrance Ingredient
cis-3-Hexenoic Acid
CAS 1775-43-5
What Is cis-3-Hexenoic Acid?
cis-3-Hexenoic Acid (CAS 1775-43-5) is an aroma chemical used as a fragrance and flavour ingredient. Its odour is described as fruity, green and pineapple, placing it within the green family as a mid note with medium volatility. With a molecular weight of 114.1 (formula C6H10O2), it is handled by perfumers as a building block for compositions where a fruity character is desired. The data below is compiled from public chemical and regulatory sources.
Safety Profile
HANDLE WITH CARE
What Does cis-3-Hexenoic Acid Smell Like?
The odour profile of cis-3-Hexenoic Acid is reported as fruity, green, pineapple, sweet, weedy. The dominant facet is its fruity 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
cis-3-Hexenoic Acid has the molecular formula C6H10O2 and a molecular weight of 114.1 g/mol. Its canonical SMILES representation is CC\C=C/CC(O)=O. Its reported log P (XLogP) of 1.43 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 | 114.1 g/mol |
|---|---|
| Boiling Point | 208.0 °C |
| Melting Point | 31.85 °C |
| Flash Point | 102.5 °C |
| Density | 0.965 g/cm³ |
| Vapor Pressure | 0.0831 mmHg |
| Water Solubility | 0.13 g/L |
| XLogP | 1.43 |
Perfumer Guide
Alternatives & Comparisons
Ingredients occupying a similar odour space — useful as substitutes or companions when cis-3-Hexenoic Acid is unavailable or restricted.
Shares fruity, green, pineapple character — a candidate substitute or companion in the same odour space.
Shares fruity, green, sweet character — a candidate substitute or companion in the same odour space.
Shares fruity, green, mild 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): 7.5e-05 ppb — a literature-curated value indicating its potency in the vapour phase.
Open cis-3-Hexenoic 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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