Oleic acid (IUPAC
name Octadecenoic acid
is a monounsaturated Ω-9 fatty acid with the molecular formula C18
Oleic acid makes up 55-80% of olive oil
there may be only 0.5-2.5% or so as actual free acid, and 15-20% of
grape seed oil
and Sea buckthorn oil.
Reduction of oleic acid at the carboxyl end yields oleyl alcohol.
Oleic acid is emitted by the decaying corpses of a number of insects, including bees and Pogonomyrmex ants and triggers the instincts of living
workers to remove the dead bodies from the hive. If a live bee or ant is daubed with oleic acid, it is dragged off as if it were dead.