Undecanal, also known as undecyl aldehyde, is an organic compound with the chemical formula or . It is an eleven-carbon aldehyde. A colourless, oily liquid, undecanal is a component of perfumes. Although it occurs naturally in citrus oils, it is produced commercially by hydroformylation of decene.
It has been registered under the EU REACH scheme at >1000 tonnes by Oxea, which confirms the status as irritant.
Undecanal is used in the synthesis of Disparlure.https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Logic_of_Organic_Synthesis_(Rao)/05%3A_Strategies_in_Disparlure_Synthesis References