Citronellal

Citronellal is a monoterpenoid aldehyde found in citronella oils. Its lemon-like odor makes it useful in fragrances and flavorings.

Monoterpenoid: A natural product or derivative built from two five-carbon isoprene units. Citronellal belongs to this broader class of compounds.
Citronellal cyclization: An acid-catalyzed intramolecular reaction that converts citronellal into isopulegol isomers. This characteristic reaction closes citronellal’s chain into a cyclic alcohol.
Citronella oil: An essential oil distilled from Cymbopogon grasses and rich in volatile terpenoids. Citronellal is a characteristic constituent of some citronella oils.
Perfumery: The art and industry of creating fragrances from odorant materials. Citronellal contributes fresh citrus notes to fragrance compositions.
Citral: A mixture of the monoterpenoid aldehyde isomers geranial and neral, with a strong lemon odor. Citral is a prominent lemon-scented aldehyde often confused with citronellal.
Aldehyde: An organic compound containing a carbonyl group bonded to at least one hydrogen atom. Citronellal’s terminal carbonyl group defines its key functional group.
Isopulegol: A cyclic monoterpenoid alcohol formed by cyclization of citronellal. It is the direct product family of citronellal’s well-known ring-forming reaction.
Lemongrass oil: An aromatic essential oil from Cymbopogon grasses, commonly rich in citral or citronellal depending on species. Some lemongrass oils provide a natural source of citronellal.
Flavoring: A substance added to food to impart or modify taste and aroma. Citronellal is used in some flavor formulations for its citrus-like character.
Linalool: An acyclic monoterpenoid alcohol with floral and citrus notes, common in essential oils. Linalool shares aromatic sources with citronellal but is an alcohol, not an aldehyde.

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Kaffir limeRelated: It is among the compounds associated with the characteristic fragrance of kaffir lime leaves.