isomenthone

Isomenthone is a monoterpene ketone in the p-menthane family and a structural isomer of menthone. It is one of several stereoisomers that arise from the menthane skeleton, and its molecular formula is C10H18O. In its pure form it is a colorless liquid with a characteristic minty odor.

Isomenthone occurs naturally in essential oils of Mentha species, particularly peppermint (Mentha x piperita), where it is present alongside other monoterpenoids such as menthone and menthol. It can be isolated from plant material through steam distillation and purification, or produced synthetically for use in fragrance applications.

In fragrance and flavor contexts, isomenthone contributes to minty notes and helps shape the aroma profile of peppermint oil. It is a chiral molecule and exists as enantiomers, with the specific enantiomeric composition potentially influencing odor perception. Because of its minty character, it is used to modify or enhance mint-related scents and flavors in cosmetic, perfumery, and food applications.

Safety and regulation follow general guidelines for monoterpene ketones. Concentrated isomenthone samples may irritate the skin or eyes, and its use in consumer products is subject to regulatory controls that vary by jurisdiction.