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CAS 1335-46-2 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

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InventoryRef 4145602/03/2011

METHYL ALPHA-IONONE ISOMERS

Methyl-alpha-cyclocitrilydenacetone; Iralia; Isoaldeine

METHYL ALPHA-IONONE ISOMERS is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 1335-46-2

CAS 1335-46-2PubChem CID 5371084

Methylionone

1-(2,6,6-Trimethyl-2-cyclohexen-1-yl)-1-penten-3-one is a sesquiterpenoid. — ChEBI

IUPAC name: (E)-1-(2,6,6-trimethylcyclohex-2-en-1-yl)pent-1-en-3-one

Molecular formula: C14H22O
Molecular weight: 206.32 g/mol
Exact mass: 206.167065321 Da
XLogP3: 3.4
Topological polar surface area: 17.1 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 1
Covalent units: 1
Defined stereocentres: 0

Also known as

Ionone, methyl-FEMA No. 2711RefChem:555432215-635-0alpha-methyl iononeMethyl iononealpha-Cetone1-(2,6,6-trimethylcyclohex-2-en-1-yl)pent-1-en-3-one

16 more reported names

1322-70-9Methyl-alpha-ionone1-PENTEN-3-ONE, 1-(2,6,6-TRIMETHYL-2-CYCLOHEXEN-1-YL)-5-(2,6,6-Trimethyl-2-cyclohexenyl)-4-penten-3-onealpha-Methylionone127-42-41-(2,6,6-Trimethyl-2-cyclohexene-1-yl)-1-penten-3-one(1E)-1-(2,6,6-trimethylcyclohex-2-en-1-yl)pent-1-en-3-oneCetone, alpha-Methylionone, alpha-(e)-1-(2,6,6-trimethylcyclohex-2-enyl)pent-1-en-3-one(1E)-1-(2,6,6-Trimethyl-2-cyclohexen-1-yl)-1-penten-3-one1-Penten-3-one, 1-((1R)-2,6,6-trimethyl-2-cyclohexen-1-yl)-, (1E)-EINECS 204-842-1EINECS 215-635-0EINECS 231-926-5

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:172145
ChEMBL:CHEMBL1371285
EPA DTXSID:DTXSID501197970

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

Inventory details for METHYL ALPHA-IONONE ISOMERS

INCI name

METHYL ALPHA-IONONE ISOMERS

Description

Methyl-alpha-cyclocitrilydenacetone; Iralia; Isoaldeine

Record provenance

Inventory reference: 41456
Imported identity: METHYL ALPHA-IONONE ISOMERS
Source update: 02/03/2011

European Commission CosIng source notes

Annex records for METHYL ALPHA-IONONE ISOMERS

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Key data

CAS

1335-46-2

215-635-0

Restriction

—

Function

PERFUMING: Used for perfume and aromatic raw materials.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#16463 · METHYL ALPHA-IONONE ISOMERS

Ingredients with overlapping formulation functions

METHYL ABIETATEPERFUMING

METHYL ACETATEPERFUMING, SOLVENT

METHYL ACETOACETATEPERFUMING

METHYL ACETYLAMINOBENZOATEPERFUMING

METHYL AMYL KETONEPERFUMING

METHYL BENZODIOXEPINONEFRAGRANCE, PERFUMING

METHYL BENZODIOXOLYLETHYL-PROPENYLAMINOBENZOATEPERFUMING

METHYL BETA-NAPHTHYL ETHERPERFUMING

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox 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

How METHYL ALPHA-IONONE ISOMERS appears in the CosIng inventory

The CosIng inventory lists METHYL ALPHA-IONONE ISOMERS as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

METHYL ALPHA-IONONE ISOMERS is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

METHYL ALPHA-IONONE ISOMERS is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, METHYL ALPHA-IONONE ISOMERS carries the following function designation(s):

PERFUMING

CAS 1335-46-2 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for METHYL ALPHA-IONONE ISOMERS

This page reproduces the CosIng inventory entry for METHYL ALPHA-IONONE ISOMERS from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research METHYL ALPHA-IONONE ISOMERS and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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