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Methyl heptine carbonate (methyl 2-octynoate)

Methyl oct-2-ynoate

Methyl 2-octynoate, Folione

Ester alkyne · Acetylenic ester · C₉H₁₄O₂

Chemical structure of Methyl heptine carbonate (methyl 2-octynoate)
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
111-12-6
Molecular formula
C₉H₁₄O₂
Molecular weight
154.21 g/mol
Origin
Synthetic
Odor family
Xanh Green
Note
Top
Aroma
Violet leaf, sharp green with cucumber and fatty facets.

History

Methyl 2-octynoate is the methyl ester of 2-octynoic acid, also misnamed "carbonate". It is among the EU's original 24 fragrance allergens.

In perfumery

Used at very low levels for violet leaf and green notes.

Connections

EvokesViolet leaf

Regulatory status

EU max 0.01% · Allergen
IFRA 51
Restricted by an IFRA Standard (entry "Methyl heptine carbonate"), current version issued at Amendment 49. Maximum levels differ across the 12 product categories.
EU CosReg
Annex III, entry 89: maximum 0.01% alone; combined with methyl octine carbonate, total not above 0.01%.
EU allergen 2023/1545
One of the original 24 labelled fragrance allergens (Annex III, entry 89). Must be named on the label above 0.001% in leave-on and 0.01% in rinse-off products.

Sources

  1. NCI/CADD Chemical Identifier Resolver, CAS 111-12-6
  2. IFRA Standards Library, Amendments up to 51
  3. Regulation (EC) No 1223/2009, consolidated text of 18.05.2026, Annexes II and III