Undecylic acid (undecanoic acid) has a strongly fatty, waxy odor with a sour, sweaty facet reminiscent of aged cheese or unwashed skin. On dry-down it softens into a creamy, slightly fruity-tallowy character, and at trace levels it can lend a lactonic-animalic warmth to floral and gourmand accords.AI · claude-opus-4-7
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Perfume and Flavor Chemicals, page 1364.
Colorless crystals or crystalline mass.
Almost insoluble in water, soluble in alcohol and oils.
Very weak, fatty-aldehydic odor with considerable variations according to origin and purity. A high-grade material has practically no odor, while a normal commercial grade smells oily-fatty in a mild, sweet and not unpleasant manner, and with good tenacity.
Undecylic acid could be used in discrete amounts to support Costus notes and various musky notes, but the material does not contribute much to a fragrance as such.
It serves as a raw material for the manufacture of a number of esters, some of which are used in perfumes, more in flavor compositions.
Produced by reduction of Undecylenic acid, which is generally obtained from Castor oil.