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Annex II Entry 437 20/10/2010

trans-2-Heptenal, when used as a fragrance ingredient

trans-2-Heptenal, when used as a fragrance ingredient is listed in Annex II as a prohibited substance for cosmetic products placed on the EU market.

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Prohibited substance— Annex II, EU Regulation 1223/2009
Entry: 437

Chemical identity and properties

PubChem 2D chemical structure for CAS 18829-55-5
CAS 18829-55-5PubChem CID 5283316

2-Heptenal

(E)-hept-2-enal is a monounsaturated fatty aldehyde that is (2E)-hept-2-ene which is carrying an oxo group at position 1. Found in the peel of Malaysian pink and white pomelo peel and in the scent gland secretion of the rice stink bug Oebalus pugnax. It has a role as a uremic toxin and a plant metabolite. It is a medium-chain fatty aldehyde, an enal and a monounsaturated fatty aldehyde. — ChEBI

IUPAC name
(E)-hept-2-enal
Molecular formula
C7H12O
Molecular weight
112.17 g/mol
Exact mass
112.088815002 Da
XLogP3
2.1
Topological polar surface area
17.1 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
1
Covalent units
1
Defined stereocentres
0

Also known as

Butylacrolein2463-63-02-hept-enalRefChem:909851219-563-0trans-2-Heptenal2-Heptenal, (2E)-hept-2-enal
16 more reported names
3-Butylacrolein2-Heptenal, (E)-(E)-2-Heptenal(E)-2-Hepten-1-albeta-Butylacrolein(2E)-2-Heptenaltrans-2-Hepten-1-al(2E)-hept-2-enal2-trans-Heptenal(2e)-heptenalFEMA No. 3165Hept-trans-2-enal.beta.-ButylacroleinHept-2(E)-enalHept-(E)-2-enaln-Hept-trans-2-enal
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Record details

Chemical name

trans-2-Heptenal, when used as a fragrance ingredient

Regulatory information

Regulation

(EC) 2009/1223

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SCCS opinions

Key data

CAS
18829-55-5
EC
242-608-0
Annex
II
Entry number
437

Direct matches are limited for this record, so nearby entries from Annex II are shown as well.

What Annex II means for trans-2-Heptenal, when used as a fragrance ingredient

trans-2-Heptenal, when used as a fragrance ingredient is listed as a prohibited substance under Annex II of EU Cosmetics Regulation 1223/2009 and must not be intentionally added. Article 17 separately addresses unintended small quantities that are technically unavoidable under good manufacturing practice and compatible with the Article 3 safety requirement.

Formulators must screen their ingredients and raw materials to ensure none contain this substance. Suppliers should provide documentation confirming absence when requested.

The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

  • Verify this substance is absent from all raw materials and finished formulations.
  • Request absence confirmation or CoA from raw material suppliers.
  • Document the screening result in the Product Information File (PIF).

Frequently asked questions

Yes. trans-2-Heptenal, when used as a fragrance ingredient is listed in Annex II of EU Cosmetics Regulation 1223/2009 and is prohibited as an intentionally added cosmetic ingredient. Article 17 provides a narrow exception for unintended small quantities that are technically unavoidable under good manufacturing practice, provided the product remains safe under Article 3.

CAS 18829-55-5 is the unique numerical identifier assigned to trans-2-Heptenal, when used as a fragrance ingredient 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.

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 II record trans-2-Heptenal, when used as a fragrance ingredient

This page summarizes one Annex II record for trans-2-Heptenal, when used as a fragrance ingredient from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex II conditions for trans-2-Heptenal, when used as a fragrance ingredient, but confirm any final regulatory decision against the current official annex wording and source files.

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