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2-Methyl-3-pent-2-enylcyclopent-2-enone

CAS 152982-57-5

Also registered as 3 other CAS numbers

8029-70-7 · 39346-90-2 · 11050-62-7

2-Methyl-3-pent-2-enylcyclopent-2-enone chemical structure

Concern score

Not assessed — no hazard data yet.

2-Methyl-3-pent-2-enylcyclopent-2-enone in plain language

What it is

On cosmetic ingredient lists it appears as “Isojasmone”.

Also known as Isojasmone · 2-METHYL-3-(2-PENTENYL)-2-CYCLOPENTEN-1-ONE · 2-Methyl-3-(pent-2-en-1-yl)cyclopent-2-en-1-one · 2-Cyclopenten-1-one, 2-methyl-3-(2-penten-1-yl)- · 2-Cyclopenten-1-one, 2-methyl-3-(2-pentenyl)- · 2-METHYL-3-((E)-PENT-2-ENYL)CYCLOPENT-2-EN-1-ONE

Show all 10 names

2-METHYL-3-(2-PENTEN-1-YL)-2-CYCLOPENTEN-1-ONE · Gvonpeqeuqyvnh-snawjcmrsa-n · Isojasmone (natural) · UNII-TY8GSG1D56

What it does

Used in cosmetics as a fragrance ingredient.

  • Perfuming
  • Fragrance
  • Flavouring
Is it a concern?
We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

Regulation

No restrictions found. 2-Methyl-3-pent-2-enylcyclopent-2-enone appears in these published regulatory listings.

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • EUCosIngActiveListed in CosIng inventory for cosmetic use.
    • Listed in CosIng inventory for cosmetic use.Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including Fragrance, Flavouring and nutrient.
    • EPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including Fragrance, Flavouring and nutrient.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

No expert opinion on file for 2-Methyl-3-pent-2-enylcyclopent-2-enone. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

Evidence & sources

No graded research studies for 2-Methyl-3-pent-2-enylcyclopent-2-enone yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

6 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EPA Chemical and Products Database

    exposure · updated February 8, 2019

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    Open →

  • PubChem Live Enrichment

    chemistry · updated 2026-05-17

    Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

Not a strong fit for fragrance avoidance because it carries Fragrance.

Avoid

The ingredient itself is a fragrance-linked signal, so it is better treated as an avoid case when fragrance exposure is the main concern.

Where it has been recorded

How often EPA CPDat has listed 2-Methyl-3-pent-2-enylcyclopent-2-enone in a product composition. These are source records, not Greenveil catalog products.

Named organisations

4

Typical roles

PerfumingFragranceFlavouring
See products using 2-Methyl-3-pent-2-enylcyclopent-2-enone →