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 |
| Tenacity1 | 100 h |
| Tenacity2 | 112 h |
1 Source: PerfumersWorld
2 Source: The Good Scents Company
Both tenacity figures are blotter life. The two labs use different evaluation protocols, so the numbers are not directly comparable — read them as two independent readings, not as a contradiction.
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
alpha-Ionone, 4-(2,6,6-Trimethyl-2-cyclohexenyl)-3-buten-2-one, 3-Buten-2-one, 4-(2,6,6-trimethyl-2-cyclohexenyl), Ionardon, Ionone Alpha, Irisone alpha, Novoviol, Rhodione, Violettone alpha incol, Ionantheme 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%, (naturals), ionone alpha regular, ionone alpha white coeur, alpha-ionone BRI, alpha-ionone extra, alpha-ionone natural, alpha-ionone refined, alpha-ionone white coeur, alpha-ionone, natural, alpha-ionone, refined, alpha-ionone, regular
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 |
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.