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Phenylacetaldehyde

2-phenylacetaldehyde

Hyacinthin, 2-Phenylethanal

Aromatic aldehyde · C₈H₈O

Chemical structure of Phenylacetaldehyde
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
122-78-1
Molecular formula
C₈H₈O
Molecular weight
120.15 g/mol
Origin
Nature-identical
Odor family
Floral
Note
Top
Aroma
Green, honeyed and hyacinth-like; sharp and leafy when concentrated.

History

Phenylacetaldehyde occurs in hyacinth, rose and honey. It polymerises readily, so it is usually sold diluted or stabilised.

In perfumery

The backbone of hyacinth accords and green florals; adds a honey note to rose.

Connections

EvokesHyacinth, Honey
Found in natureHyacinth, Rose

Regulatory status

IFRA restricted
IFRA 51
Restricted by an IFRA Standard (entry "Phenylacetaldehyde"), 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 122-78-1
  2. IFRA Standards Library, Amendments up to 51
  3. Regulation (EC) No 1223/2009, consolidated text of 18.05.2026, Annexes II and III