(+/-)-2-Phenyl-4-Methyl-2-Hexenal (CAS 26643-92-5) — Base Note Fragrance Ingredient
(+/-)-2-Phenyl-4-Methyl-2-Hexenal
CAS 26643-92-5
What Is (+/-)-2-Phenyl-4-Methyl-2-Hexenal?
(+/-)-2-Phenyl-4-Methyl-2-Hexenal (CAS 26643-92-5) is an aroma chemical used as a fragrance and flavour ingredient. Its odour is described as sweet, cocoa and nutty, placing it within the green family as a base note with low volatility. With a molecular weight of 188.3 (formula C13H16O), it is handled by perfumers as a building block for compositions where a sweet character is desired. The data below is compiled from public chemical and regulatory sources.
Safety Profile
GENERALLY SAFE
What Does (+/-)-2-Phenyl-4-Methyl-2-Hexenal Smell Like?
The odour profile of (+/-)-2-Phenyl-4-Methyl-2-Hexenal is reported as sweet, cocoa, nutty, rose, green, fruity. The dominant facet is its sweet 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
(+/-)-2-Phenyl-4-Methyl-2-Hexenal has the molecular formula C13H16O and a molecular weight of 188.3 g/mol. Its canonical SMILES representation is CCC(C)C=C(C=O)C1=CC=CC=C1. Its reported log P (XLogP) of 3.31 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 | 188.3 g/mol |
|---|---|
| Boiling Point | 299.3 °C |
| Melting Point | 28.32 °C |
| Flash Point | 121.1 °C |
| Density | 0.8449 g/cm³ |
| Vapor Pressure | 0.000587 mmHg |
| Water Solubility | 0.00082 g/L |
| XLogP | 3.31 |
Perfumer Guide
Alternatives & Comparisons
Ingredients occupying a similar odour space — useful as substitutes or companions when (+/-)-2-Phenyl-4-Methyl-2-Hexenal is unavailable or restricted.
Shares floral, fruity, green character — a candidate substitute or companion in the same odour space.
Shares fruity, rose, sweet 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.
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.
Open (+/-)-2-Phenyl-4-Methyl-2-Hexenal 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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