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Citral dimethyl acetal

(2E)-1,1-dimethoxy-3,7-dimethylocta-2,6-diene

1,1-Dimethoxy-3,7-dimethyl-2,6-octadiene

Acetal terpenoid · Terpenoid acetal · C₁₂H₂₂O₂

Chemical structure of Citral dimethyl acetal
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
7549-37-3
Molecular formula
C₁₂H₂₂O₂
Molecular weight
198.30 g/mol
Origin
Synthetic
Odor family
Citrus
Note
Top
Aroma
Lemon and lemongrass, slightly green; softer than citral.

History

Acetalising citral with methanol masks the aldehyde group, keeping the lemon note stable in alkaline media such as soap.

In perfumery

Used for lemon notes in soap and cleaners. In acidic media the acetal can hydrolyse back to citral.

Connections

EvokesLemon, Citral
Found in natureCitral (precursor)

Regulatory status

May release citral
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 7549-37-3
  2. IFRA Standards Library, Amendments up to 51
  3. Regulation (EC) No 1223/2009, consolidated text of 18.05.2026, Annexes II and III