Methyl-Alpha Ionone
Aroma Chemical Heart Note CAS 127-42-4
A soft violet note with a woody orris character. Floral and natural, it adds a powdery violet lift to compositions.
Odor profile
| Note | Heart Note |
| Descriptor 1 | Woody |
| Descriptor 2 | Floral |
| Descriptor 3 | Violet |
| Tenacity2 | 124 h |
2 Source: The Good Scents Company
Identification
| CAS Number | 127-42-4 |
| INCI Name | Alpha-methyl-alpha-ionone |
| Category | Aroma Chemical |
| Formula | C14H22O |
| Mol. Weight | 206.32 |
| IUPAC Name | (E)-1-[(1R)-2,6,6-trimethylcyclohex-2-en-1-yl]pent-1-en-3-one |
| InChIKey | VPKMGDRERYMTJX-XEHSLEBBSA-N |
Synonyms
Methyl-Alpha-Ionone, (E)-1-(2,6,6-trimethyl-1-cyclohex-2-enyl)pent-1-en-3-one (44-50%)
Physical and chemical data
| Boiling Point | 238.00 °C |
| Flash Point | 100.00 °C |
| Density | 0.928 to 0.934 |
| Refractive Index | 1.496 to 1.503 |
| Vapor Pressure | 0.003000 mmHg @ 25.00 C. (est) |
| LogP | 4.393 |
| Solubility | alcohol; water, 3.328 mg/L @ 25 C (est) |
| Appearance | colorless to yellow clear liquid |
Regulatory status
IFRA maximum concentrations
| Category | Use | Limit in the finished product |
|---|---|---|
| Category 1 | Lip products, toys | 5.4 % |
| Category 2 | Deodorants, antiperspirants | 1.6 % |
| Category 3 | Eye products | 32 % |
| Category 4 | Fine fragrance | 30 % |
| Category 5A | Body lotion | 7.6 % |
| Category 5B | Face cream | 7.6 % |
| Category 5C | Hand cream | 7.6 % |
| Category 5D | Baby creams, oils | 7.6 % |
| Category 6 | Oral care, mouthwash | 18 % |
| Category 7A | Rinse-off hair products | 61 % |
| Category 7B | Leave-on hair products | 61 % |
| Category 8 | Intimate and baby wipes | 3.2 % |
| Category 9 | Soap, shampoo, rinse-off | 59 % |
| Category 10A | Household care, hand contact | 100 % |
| Category 10B | Aerosol air fresheners | 100 % |
| Category 11A | Intended skin contact | 100 % |
| Category 11B | Minimal skin contact | 100 % |
| Category 12 | No skin contact, candles | Not restricted |
| IFRA Amendment | 49 |
| Restriction Type | Restriction / Specification |
| Critical Effect | Dermal Sensitization |
| Specification | Pseudo methyl ionones (CAS numbers 26651-96- 7, 72968-25-3, 1117-41-5) should not be used as fragrance ingredient as such. A level of up to 2% of Pseudo methyl ionones as an impurity in Methyl ionones is accepted. Page 189 of 709 Amendment 49 Methyl ionone, mixed isomers 2020 (Amendment 49) 3/4 IFRA STANDARD |
Restricted components
| Component | Share |
|---|---|
| Alpha Isomethyl Ionone | 9 % |
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 | 9 % |
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.