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Hydratropic aldehyde (2-phenylpropanal)

2-Phenylpropanal

2-Phenylpropionaldehyde, Hydratropaldehyde

Aromatic aldehyde · C₉H₁₀O

Chemical structure of Hydratropic aldehyde (2-phenylpropanal)
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
93-53-8
Molecular formula
C₉H₁₀O
Molecular weight
134.18 g/mol
Origin
Synthetic
Odor family
Floral
Note
Top
Aroma
Green and hyacinth-like with almond and crushed leaf facets.

History

2-phenylpropanal is the branched isomer of phenylpropanal and a long-standing perfumery material. It is somewhat more stable than phenylacetaldehyde.

In perfumery

Used in hyacinth, lilac and green floral accords.

Connections

EvokesHyacinth

Regulatory status

IFRA restricted
IFRA 51
Restricted by an IFRA Standard (entry "2-Phenylpropionaldehyde"), current version issued at Amendment 49. Maximum levels differ across the 12 product categories.
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 93-53-8
  2. IFRA Standards Library, Amendments up to 51
  3. Regulation (EC) No 1223/2009, consolidated text of 18.05.2026, Annexes II and III