Official EU label nameGlossary entry 366

5-METHYL-ALPHA-IONONE

This record confirms an official common ingredient name for EU cosmetic product labelling. It does not by itself confirm that the substance is permitted, unrestricted or safe.

Global evidence snapshot

The resolved identity has matching regulatory evidence in 0 of 13 indexed market datasets: 0 country records and 0 EU Annex records. Every result and evidence gap is listed below.

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Resolved identifiers

Resolved substance identity

CAS:79-69-6

EC:201-219-6

Ingredient index records:

5-METHYL-ALPHA-IONONE

Cosmetic functions: PERFUMING

cis-4-(2,5,6,6-Tetramethylcyclohex-2-enyl)but-3-en-2-one; 6-Methylionone; 6-Methyl-alpha-ionone; cis-(2,6)-cis-(2(1),2(2))-alpha-Irone; alpha-Irone

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1 matched or reported name

5-METHYL-ALPHA-IONONE

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name 5-METHYL-ALPHA-IONONE.

That is a statement about this inventory, not about the law: no imported rule is not evidence that a substance is permitted. A rule may exist under a different name, under a CAS or EC number this glossary entry does not carry, or in a dataset not yet imported.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 79-69-6

CAS 79-69-6PubChem CID 5371002

alpha-Irone

Alpha-irone is a methyl ketone that is alpha-ionone in which a hydrogen at position 5 of the cyclohex-2-en-1-yl ring is substituted by a methyl group. It is an enone and a methyl ketone. It is functionally related to an alpha-ionone. — ChEBI

IUPAC name: (E)-4-(2,5,6,6-tetramethylcyclohex-2-en-1-yl)but-3-en-2-one

Molecular formula: C14H22O
Molecular weight: 206.32 g/mol
Exact mass: 206.167065321 Da
XLogP3: 3.2
Topological polar surface area: 17.1 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 1
Covalent units: 1
Defined stereocentres: 0

Also known as

Methyl alpha-ionone6-Methyl-alpha-ionone4-(2,5,6,6-Tetramethylcyclohex-2-enyl)but-3-en-2-oneFEMA No. 25974-(2,5,6,6-Tetramethyl-2-cyclohexen-1-yl)-3-buten-2-oneCHEBI:10284(3E)-4-(2,5,6,6-tetramethylcyclohex-2-en-1-yl)but-3-en-2-oneO3M0L879K6

16 more reported names

RefChem:915528201-219-66-MethyliononeIrone4-(2,5,6,6-tetramethylcyclohex-2-en-1-yl)but-3-en-2-onealpha-Ironalpha-Ionone, methyl-6-Methyl iononeEINECS 201-219-6Ionone 6-Methyl, alpha2,6-cis-(2(1),2(2))-alpha-Ionone, cis-4-(2,5,6,6-Tetramethyl-2-cyclo-hexen-1-yl)-3-buten-2-one3-Buten-2-one, 4-(2,5,6,6-tetramethyl-2-cyclohexen-1-yl)-Irone, alpha-|A-ironeCyclocitrylidenebutanone, alpha-

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External database identifiers

ChEBI:CHEBI:10284
ChEMBL:CHEMBL3183603
EPA DTXSID:DTXSID4047042

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Additional authoritative substance research

Each link searches that source for this identity. A link is a research route, not a claim that the source holds an exact record. What each source is, and its legal weight

Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal US EPA CompTox CTX APIs

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Official source and scope

Imported from Commission Implementing Decision (EU) 2025/1175 (dataset version EU 2025/1175). The glossary supplies common ingredient names for the ingredient list required by Article 19(1)(g); it is not an approval or safety list.

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