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beta-Damascone

1-(2,6,6-trimethyl-1-cyclohexenyl)but-2-en-1-one

trans-Rose ketone 2

Ketone norisoprenoid (rose ketone) · Rose ketone · C₁₃H₂₀O

Chemical structure of beta-Damascone
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
23726-91-2
Molecular formula
C₁₃H₂₀O
Molecular weight
192.30 g/mol
Origin
Nature-identical
Odor family
Floral
Note
Heart
Aroma
Ripe plum, rose, tobacco and blackcurrant; warm and sweet.

History

beta-damascone differs from alpha-damascone in the position of the ring double bond. It has been reported in traces in some essential oils and foods.

In perfumery

Adds plum and tobacco depth to rose and amber accords; also used in flavours.

Connections

EvokesPlum, Tobacco

Regulatory status

IFRA · EU max 0.02% · Rose ketones
IFRA 51
Restricted by an IFRA Standard (entry "Rose ketones"), current version issued at Amendment 49. Maximum levels differ across the 12 product categories.
EU CosReg
Annex III, entry 157 (rose ketones group): maximum 0.02% total rose ketones in the finished product; labelled collectively as "Rose Ketones".
EU allergen 2023/1545
Quy (EU) 2023/1545 sung ghi "Rose Ketones" khi 0.001 da) 0.01 ra 31/7/2026, 31/7/2028. Regulation (EU) 2023/1545 added labelling as "Rose Ketones" above 0.001% (leave-on) and 0.01% (rinse-off). Transition: placing on the market until 31 July 2026, making available until 31 July 2028.

Sources

  1. NCI/CADD Chemical Identifier Resolver, CAS 23726-91-2
  2. IFRA Standards Library, Amendments up to 51
  3. Regulation (EC) No 1223/2009, consolidated text of 18.05.2026, Annexes II and III
  4. Commission Regulation (EU) 2023/1545 amending Annex III (fragrance allergen labelling)