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Annex III Entry 177 23/05/2013

2-Hexylidene cyclopentanone

2-Hexylidene cyclopentanone is listed in Annex III and may only be used under the conditions shown in this record. Maximum concentration in this record: (b) 0.06%.

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Restricted substance— Annex III, EU Regulation 1223/2009
Max conc.: (b) 0.06%
Entry: 177

Chemical identity and properties

PubChem 2D chemical structure for CAS 17373-89-6
CAS 17373-89-6PubChem CID 6385721

2-Hexylidenecyclopentanone

2-Hexylidenecyclopentanone is a cyclic ketone. — ChEBI

IUPAC name
(2E)-2-hexylidenecyclopentan-1-one
Molecular formula
C11H18O
Molecular weight
166.26 g/mol
Exact mass
166.135765193 Da
XLogP3
3.3
Topological polar surface area
17.1 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
1
Covalent units
1
Defined stereocentres
0

Also known as

2-hexylidene cyclopentanonealpha-HexylidenecyclopentanoneHexylidenecyclopentanone, 2-Cyclopentanone, 2-hexylidene-2-(Hexylidene)-1-cyclopentanoneGTY12E9096(2Z)-2-hexylidenecyclopentan-1-oneRefChem:87311
8 more reported names
241-411-7(2E)-2-HexylidenecyclopentanoneEINECS 241-411-7(E)-2-Hexylidenecyclopentan-1-one2-Hexylidene cyclopentanone [FHFI]UNII-GTY12E9096CHEBI:171822.ALPHA.-HEXYLIDENECYCLOPENTANONE
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.

Record details

Maximum concentration

(b) 0.06%

Product type

Oral products Other products

Chemical name

2-Hexylidene cyclopentanone

Regulatory information

Regulation

(EC) 2013/344

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SCCS opinions

Identified ingredients

Key data

CAS
17373-89-6
EC
241-411-7
Annex
III
Entry number
177

Inventory links for 2-Hexylidene cyclopentanone

What Annex III means for 2-Hexylidene cyclopentanone

2-Hexylidene cyclopentanone is a restricted substance under Annex III of EU Cosmetics Regulation 1223/2009. Its use in cosmetics is only permitted under the specific conditions set out in the entry above, including applicable concentration limits, product type restrictions and required warning statements.

When including this substance in a formulation, all conditions — maximum concentration, product scope and warning labels — must be met simultaneously. Compliance with one condition does not override the others.

This record is linked to 1 CosIng inventory ingredient for name and identifier cross-reference. The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

  • Ensure formulation concentration does not exceed: (b) 0.06%
  • Confirm product type compatibility: (a) Oral products (b) Other products
  • Document conditions of use in the Product Information File (PIF).

Frequently asked questions

2-Hexylidene cyclopentanone is listed in Annex III of EU Regulation 1223/2009 as a restricted substance. It may only be used under the conditions specified in the entry, including any maximum concentration, product type limitation and required warning statements shown above.

CAS 17373-89-6 is the unique numerical identifier assigned to 2-Hexylidene cyclopentanone by the Chemical Abstracts Service. In cosmetic compliance work, the CAS number is used to cross-reference the substance across regulatory databases, raw material specifications and safety assessment reports. Multiple EU annex entries may share the same CAS number if the same substance appears under different conditions or in different annexes.

The maximum concentration of (b) 0.06% applies to the concentration of the substance in the ready-to-use cosmetic product. When the substance is supplied as part of a blend or mixture, the calculation must account for the contribution of all sources in the formulation. The combined concentration must not exceed the stated limit.

Use the INCI Checker tool on this site to paste your full ingredient list (INCI) and scan it against all Annex II–VI entries. The tool highlights any ingredients that match restricted, prohibited or allergen-flagged records. This is useful for rapid compliance screening of finished product formulas or raw material declarations.
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Source note for Annex III record 2-Hexylidene cyclopentanone

This page summarizes one Annex III record for 2-Hexylidene cyclopentanone from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex III conditions for 2-Hexylidene cyclopentanone, but confirm any final regulatory decision against the current official annex wording and source files.

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