Angelic acid has a sharp, pungent, sour-acidic odor reminiscent of the roots of angelica and other umbelliferous plants. It carries a green, herbaceous, slightly rancid-buttery facet that quickly fades, leaving a faint acrid warmth.AI · claude-opus-4-7
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Perfume and Flavor Chemicals, page 107.
White crystals
Slightly soluble in water, soluble in alcohol and oils.
Peculiar spicy-caramellic, slightly acid odor.
Herbaceous-acid taste, pleasant at proper dilution.
The acid itself does not find much use in perfumery beyond that of being a trace ingredient in artificial or 'reconstituted' essential oils, where it may have been identified by analysis of the natural oil.
The acid is occasionally used in flavor compositions, but due to the poor stability of the aqueous solution, the Tiglic acid is preferred over the Angelic for flavor work.
Among many methods known, one uses 2-Hydroxy-2-butyronitrile to produce Tiglic acid, from which Angelic can be made by Bromine treatment. Another method goes directly from alpha-Hydroxy-alpha-methyl-butyric acid which by dehydration yields Angelic acid, or a mixture of Angelic and Tiglic acids.