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2,6-Nonadienal (violet leaf aldehyde)

(2E,6Z)-nona-2,6-dienal

Violet leaf aldehyde, Cucumber aldehyde, trans-2,cis-6-Nonadienal

Unsaturated aldehyde · C₉H₁₄O

Chemical structure of 2,6-Nonadienal (violet leaf aldehyde)
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
557-48-2
Molecular formula
C₉H₁₄O
Molecular weight
138.21 g/mol
Origin
Nature-identical
Odor family
Xanh Green
Note
Top
Aroma
Cucumber skin and violet leaf, cool green and slightly oily; extremely potent.

History

(E,Z)-2,6-nonadienal is the character compound of cucumber and occurs in violet leaf absolute. Its odour threshold is very low, so traces suffice.

In perfumery

Used at parts-per-million levels in violet leaf, cucumber and watery accords. It overwhelms easily.

Connections

EvokesCucumber, Violet leaf
Found in natureViolet leaf

Regulatory status

No specific limit
IFRA 51
No dedicated IFRA Standard in the IFRA library as of Amendment 51.
EU CosReg
No specific entry in Annex II or III of Regulation (EC) 1223/2009.
EU allergen 2023/1545
Not on the list of fragrance allergens requiring labelling, including after Regulation (EU) 2023/1545.

Sources

  1. NCI/CADD Chemical Identifier Resolver, CAS 557-48-2
  2. IFRA Standards Library, Amendments up to 51
  3. Regulation (EC) No 1223/2009, consolidated text of 18.05.2026, Annexes II and III