Flavors & Fragrances
REACH
alpha-isomethyl ionone
CAS Number
127-51-5
EC Number
204-846-3
FEMA Number
FEMA 2714
What is alpha-isomethyl ionone?
Alpha-isomethyl ionone (CAS 127-51-5), also known as α-cetone and listed under FEMA 2714, is a synthetic musk-violet fragrance ingredient.
Where is alpha-isomethyl ionone used?
- Fine fragrances and body lotions: soft, powdery, woody-violet character
- Shampoos and soaps: lasting floral-woody depth and improved scent longevity on skin
- Coatings and printing inks: masking of solvent odors
- Adhesives and sealants: odor neutralization in consumer-facing formulations
- Flavor systems: violet or orris-type notes where specified
- Perfumers rely on it as a fixative and blending base in finished fragrance compositions.
Good to know: Fragrance-grade and flavor-grade specifications exist; the latter conforms to FEMA and FCC standards.
Commercial specifications
- Fragrance-grade and flavor-grade specifications
- Bulk supply in drums and IBCs
- Smaller packaging for laboratory and formulation sampling
Other Names (Synonyms)
α-isomethyl ionone|α-cetone|3-Methyl-4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-one|(3E)-3-methyl-4-(2,6,6-trimethylcyclohex-2-en-1-yl)but-3-en-2-one|RefChem:1068240|Cetone alpha|Isomethyl-alpha-ionone|Isonaline 70
What are the physical properties of alpha-isomethyl ionone?
Boiling Point 86-88 °C @ Press: 0.1 Torr
Density 0.9520 g/cm³ @ Temp: 20 °C
Color Light orange to Yellow to Green
Odor at 10.00 % in dipropylene glycol. woody violet floral
Form liquid
Water Solubility 27.953mg/L at 25℃
Vapor Pressure 0.22Pa at 20℃
Refractive Index 1.50188 (589.3 nm 20℃)
Log P 4.288 at 25℃
How is alpha-isomethyl ionone classified and handled safely? Learn More
Warning
GHS07· Irritant GHS09· Environmental Hazard
Hazard Statements
H315 Causes skin irritation
H317 May cause an allergic skin reaction
H319 Causes serious eye irritation
H400 Very toxic to aquatic life
Precautionary Statements
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P272 Contaminated work clothing should not be allowed out of the workplace.
P273 Avoid release to the environment.
Which trade and regulatory codes apply to alpha-isomethyl ionone?
HS Code 2914.23.0000
UN Number 1230
Packing Group II
Storage Class 10 - Combustible liquids
WGK (Germany) 2