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InventoryRef 4077102/03/2011

METHYLPENTENYL-CYCLOPENTENONE

(E)-3-Methyl-2-(pent-2-enyl)cyclopent-2-en-1-one

METHYLPENTENYL-CYCLOPENTENONE 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 6261-18-3
CAS 6261-18-3PubChem CID 1549019

trans-Jasmone

Trans-Jasmone is a ketone. — ChEBI

IUPAC name
3-methyl-2-[(E)-pent-2-enyl]cyclopent-2-en-1-one
Molecular formula
C11H16O
Molecular weight
164.24 g/mol
Exact mass
164.120115130 Da
XLogP3
2.2
Topological polar surface area
17.1 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
1
Covalent units
1
Defined stereocentres
0

Also known as

Jasmone, (E)-7TCS3Y45DR2-Cyclopenten-1-one, 3-methyl-2-(2E)-2-pentenyl-3-methyl-2-[(2E)-pent-2-en-1-yl]cyclopent-2-en-1-one3-methyl-2-((2E)-pent-2-en-1-yl)cyclopent-2-en-1-oneRefChem:1100273228-410-7(E)-jasmone
16 more reported names
2-Cyclopenten-1-one, 3-methyl-2-(2-pentenyl)-, (E)-(E)-3-Methyl-2-(pent-2-enyl)cyclopent-2-en-1-one(E)-3-methyl-2-(pent-2-en-1-yl)cyclopent-2-en-1-one2-Cyclopenten-1-one, 3-methyl-2-(2E)-2-penten-1-yl-2-Cyclopenten-1-one, 3-methyl-2-(2Z)-2- pentenyl-UNII-7TCS3Y45DRcis-asmoneEINECS 228-410-7cis-3-methyl-2-pent-2-enyl-cyclopent-2-enoneJASMONE, TRANS-3-Methyl-2-(2-pentenyl)-2-cyclopentene-1-one, (E)-JASMONE TRANS-FORM [MI]CHEBI:88585CS-0137943trans-3-methyl-2-pent-2-enyl-cyclopent-2-enone3-Methyl-(cis-2-penten-1-yl)-2-cyclopenten-1-one
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

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 METHYLPENTENYL-CYCLOPENTENONE

INCI name

METHYLPENTENYL-CYCLOPENTENONE

Description

(E)-3-Methyl-2-(pent-2-enyl)cyclopent-2-en-1-one

Record provenance

Inventory reference
40771
Imported identity
METHYLPENTENYL-CYCLOPENTENONE
Source update
02/03/2011
European Commission CosIng source notes
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Key data

CAS
6261-18-3
EC
228-410-7
Restriction
—
Function
PERFUMING
Used for perfume and aromatic raw materials.

Ingredients with overlapping formulation functions

METHYLOCTENOLPERFUMING
METHYLOCTENYL ACETATEPERFUMING
METHYLOCTYL ACETALDEHYDEPERFUMING
METHYLPENTENYL-CYCLOHEXENE-1-METHYL ACETATEPERFUMING
METHYLPENTENYLCYCLOHEXENE CARBALDEHYDEPERFUMING
METHYLPHENOXY-ACETALDEHYDEPERFUMING
METHYLPHENOXY-ETHANOLPERFUMING
METHYLPHENYL-1,3-DIOXANOLPERFUMING

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 chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How METHYLPENTENYL-CYCLOPENTENONE appears in the CosIng inventory

The CosIng inventory lists METHYLPENTENYL-CYCLOPENTENONE 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.

METHYLPENTENYL-CYCLOPENTENONE 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

METHYLPENTENYL-CYCLOPENTENONE 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, METHYLPENTENYL-CYCLOPENTENONE carries the following function designation(s):

CAS 6261-18-3 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 METHYLPENTENYL-CYCLOPENTENONE

This page reproduces the CosIng inventory entry for METHYLPENTENYL-CYCLOPENTENONE 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 METHYLPENTENYL-CYCLOPENTENONE 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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