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trans-2-Hexenal (leaf aldehyde)

(E)-hex-2-enal

Leaf aldehyde, (E)-2-Hexenal

Unsaturated aldehyde · C₆H₁₀O

Chemical structure of trans-2-Hexenal (leaf aldehyde)
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
6728-26-3
Molecular formula
C₆H₁₀O
Molecular weight
98.14 g/mol
Origin
Nature-identical
Odor family
Xanh Green
Note
Top
Aroma
Sharp green, crushed leaves and green apple skin; highly volatile.

History

trans-2-hexenal is formed by plants as soon as leaves are damaged, together with cis-3-hexenol. It is part of the smell of freshly cut grass.

In perfumery

Used in traces for fresh green lift in fruit and leaf accords. Tightly limited by both IFRA and the EU.

Connections

EvokesCut grass, Green apple
Found in natureTea leaf, cis-3-Hexenol

Regulatory status

IFRA restricted · EU 0.002%
IFRA 51
Restricted by an IFRA Standard (entry "2-Hexenal"), current version issued at Amendment 51. Maximum levels differ across the 12 product categories.
EU CosReg
Annex III, entry 166: maximum 0.002% in the finished product (other than oral products).
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 6728-26-3
  2. IFRA Standards Library, Amendments up to 51
  3. Regulation (EC) No 1223/2009, consolidated text of 18.05.2026, Annexes II and III