Beta Ionone
Aroma Chemical Base Note CAS 79-77-6
Soft, powdery violet with a warm, slightly woody orris character and a gentle fruity sweetness recalling raspberry. It gives a retro floral powderiness and rounds violet, berry and floral accords.
Odor profile
| Note | Base Note |
| Descriptor 1 | Floral |
| Descriptor 2 | Violet |
| Descriptor 3 | Woody |
| Odor Impact1 | 120 |
| Impact Level | Medium |
| Tenacity1 | 100 h |
| Tenacity2 | 48 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 | 79-77-6 |
| CAS 2 | 14901-07-6 |
| INCI Name | Ionone |
| Category | Aroma Chemical |
| Formula | C13H20O |
| Mol. Weight | 192.30 |
| IUPAC Name | (E)-4-(2,6,6-trimethylcyclohexen-1-yl)but-3-en-2-one |
| InChIKey | PSQYTAPXSHCGMF-BQYQJAHWSA-N |
Synonyms
(E)-Beta-ionone, Beta-ionone, beta-irisone, 4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-3-buten-2-one, Irisone beta, beta-Ionone R, Ionantheme beta, Trans-beta-ionone, nat.beta-ionone, trans-ionone beta, trans-ionone beta natural, (3E)-4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-3-buten-2-one, (E)-4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-3-buten-2-one, trans-4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-3-buten-2-one, trans-4-trimethyl-1-cyclohexenyl-3-buten-2-one, (E)-4-(2,6,6-trimethylcyclohexen-1-yl)but-3-en-2-one, (E)-4-[(5R)-5,6,6-trimethylcyclohexen-1-yl]but-3-en-2-one, 3-buten-2-one, 4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-, beta-cyclocitrylidene acetone, beta-ionone 50% in ETOH EEC natural, beta-ionone 50% in ETOH natural, ionone beta, ionone beta 50%, natural, ionone beta crude, ionone beta, pure, beta-ionone natural, beta-ionone, natural, beta-ionones EEC natural, iralia B, 4-(2,6,6-trimethyl cyclohex-1-ene-1-yl) but-3-ene-2-one, 4,2,6,6-trimethyl-1-cyclohexen-1-yl-3-buten-2-one, 4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-3-buten-2-on, 4-(2,6,6-trimethyl-1-cyclohexenyl)-3-buten-2-one, 4-(2,6,6-trimethyl-cyclohex-1-enyl)-but-3-en-2-one, 4-(2,6,6-trimethylcyclohex-1-en-1-yl)but-3-en-2-one, 4-(2,6,6-trimethylcyclohex-1-enyl)but-3-en-2-one, 4-(2,6,6-trimethylcyclohexen-1-yl)but-3-en-2-one, Ionone, beta
Physical and chemical data
| Boiling Point | 267.5 °C |
| Melting Point | -35.0 °C |
| Flash Point | 112.8 °C |
| Density | 0.9462 |
| Refractive Index | 1.5202 |
| Vapor Pressure | 0.054 mm Hg at 25 °C |
| LogP | 2.9 |
| Solubility | In water, 169 mg/L at 25 °C |
| Appearance | Beta-ionone is a colorless to light yellow liquid with an odor of cedar wood. In very dilute alcoholic solution the odor resembles odor of violets. Used in perfumery. |
Regulatory status
Restricted components
| Component | Share |
|---|---|
| Alpha Isomethyl Ionone | 0.02 % |
IFRA regulated substances contained in this material. The interactive index derives the effective maximum concentration per category from them.
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.