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Cyclotene (maple lactone)

2-hydroxy-3-methylcyclopent-2-en-1-one

Cyclotene, Methyl cyclopentenolone, Maple lactone, MCP

Cyclopentenolone · Cyclopentenolone · C₆H₈O₂

Chemical structure of Cyclotene (maple lactone)
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
80-71-7
Molecular formula
C₆H₈O₂
Molecular weight
112.13 g/mol
Origin
Nature-identical
Odor family
Gourmand
Note
Base
Aroma
Maple syrup, caramel and light licorice with a smoky touch.

History

Methyl cyclopentenolone (trade name Cyclotene) forms during roasting and cooking; it occurs in coffee and maple syrup.

In perfumery

Used in maple, caramel and tobacco accords.

Connections

EvokesSiro phong · Maple syrup
Found in natureRoasted coffee, Maple syrup

Regulatory status

No specific limit
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 80-71-7
  2. IFRA Standards Library, Amendments up to 51
  3. Regulation (EC) No 1223/2009, consolidated text of 18.05.2026, Annexes II and III