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  • cleaning

(E)-3,4,5,6,6-Pentamethylhept-3-en-2-one

CAS 81786-73-4

Also registered as 1 other CAS number

81786-74-5

(E)-3,4,5,6,6-Pentamethylhept-3-en-2-one chemical structure

Concern score

Not assessed — no hazard data yet.

(E)-3,4,5,6,6-Pentamethylhept-3-en-2-one in plain language

What it is

On cosmetic ingredient lists it appears as “Pentamethylheptenone”.

Also known as Pentamethylheptenone · (3E)-3,4,5,6,6-Pentamethyl-3-hepten-2-one · Pentamethylheptenone, (3E)- · (3E)-3,4,5,6,6-Pentamethylhept-3-en-2-one · (e)-woody amylene · (3E)-pentamethylheptenone

Show all 12 names

3-HEPTEN-2-ONE, 3,4,5,6,6-PENTAMETHYL-, (e)- · 3-Hepten-2-one, 3,4,5,6,6-pentamethyl- · 3-Hepten-2-one, 3,4,5,6,6-pentamethyl-, (3E)- · Ixiywqifbrzmnr-cmdggobgsa-n · UNII-2LWQ06RVCD · UNII-794M63V15G

What it does

Used in cosmetics as a fragrance ingredient.

  • Perfuming
  • Fragrance
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. (E)-3,4,5,6,6-Pentamethylhept-3-en-2-one appears in these published regulatory listings.

Recorded in these product areas

  • Found in consumer products
  • Cleaning
  • EUCosIngActivePentamethylheptenone is the organic compound that conforms to the formula
    • Pentamethylheptenone is the organic compound that conforms to the formulaSource →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 22 composition records across product categories including Cleaning products and household care, Vehicle. EPA CPDat classifies this chemical for functional uses including Fragrance.
    • EPA CPDat observed this chemical in 22 composition records across product categories including Cleaning products and household care, Vehicle. EPA CPDat classifies this chemical for functional uses including Fragrance.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 (E)-3,4,5,6,6-Pentamethylhept-3-en-2-one. 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 (E)-3,4,5,6,6-Pentamethylhept-3-en-2-one 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 2020-04-06

    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 →
Reference links (1)
Openfda substance

thegoodscentscompany.com

Read →

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 (E)-3,4,5,6,6-Pentamethylhept-3-en-2-one in a product composition. These are source records, not Greenveil catalog products.

Source records

22

Named organisations

3

Cleaning products and household careVehicle

Typical roles

PerfumingFragrance
See products using (E)-3,4,5,6,6-Pentamethylhept-3-en-2-one →