Alpha Ionone
Aroma Chemical Base Note CAS 127-41-3
Soft, powdery violet with a woody, orris character and a gentle raspberry fruitiness. Mild and elegant, it builds violet, orris and powdery floral accords.
Odor profile
| Note | Base Note |
| Descriptor 1 | Floral |
| Descriptor 2 | Violet |
| Descriptor 3 | Fruity |
| Odor Impact1 | 100 |
| Tenacity2 | 112 h |
1 Source: PerfumersWorld
2 Source: The Good Scents Company
Identification
| CAS Number | 127-41-3 |
| INCI Name | Alpha-ionone |
| Category | Aroma Chemical |
| Formula | C13H20O |
| Mol. Weight | 192.30 |
| IUPAC Name | (E)-4-(2,6,6-trimethylcyclohex-2-en-1-yl)but-3-en-2-one |
| InChIKey | UZFLPKAIBPNNCA-BQYQJAHWSA-N |
Synonyms
Ionone Alpha; Irisone alpha; alphaline 70; 3-buten-2-one, 4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-, (3E)-; (E)-alpha-cyclocitrylidene acetone; trans-alpha-cyclocitrylidene acetone; ionanthem; (±)-(E)-alpha-ionone; (±)-trans-alpha-ionone; (E)-a-ionone; (E)-alpha-ionone; a-ionone; nat.alpha-ionone; trans-alpha-ionone; alpha-ionone (natural); alpha-ionone 50% in ETOH natural; alpha-ionone 60; alpha-ionone 70; alpha-ionone 80; alpha-ionone 90; alpha-ionone 90%; ionone alpha regular; ionone alpha white coeur; alpha-ionone BRI; alpha-ionone extra; alpha-ionone natural; alpha-ionone refined; alpha-ionone white coeur
Physical and chemical data
| Boiling Point | 237.5 °C |
| Flash Point | 118.0 °C |
| Density | 0.9319 |
| Refractive Index | 1.4982 |
| Vapor Pressure | 0.019 mm Hg at 25 C (extrapolated from higher temperatures) |
| LogP | 3 |
| Solubility | In water, 106 mg/L at 25 °C |
| Appearance | Liquid; CBI |
Regulatory status
Restricted components
| Component | Share |
|---|---|
| Pseudoionone | 0.5 % |
IFRA regulated substances declared for this material. For naturals — which are mixtures of many molecules — the interactive index derives the effective maximum concentration per category from them. On single molecules these shares are purity traces from the supplier specification; they are far too small to limit use and are therefore not counted.
EU allergen declaration
| Substance | Share |
|---|---|
| alpha-Isomethyl ionone | 0.02 % |
Substances that must be named in the ingredient list under Annex III of Regulation (EC) 1223/2009, as amended by Regulation (EU) 2023/1545. Where a range was given, the upper bound is shown.
All figures on this page are guide values collected from public reference works and supplier declarations. They differ between batches, origins and qualities. The data sheet of your own supplier is always the authoritative document for the material you actually use.