Butylidene acetone (3-hepten-2-one, also known as ethylidene acetone in some references) is a sharp, pungent unsaturated ketone with a green, slightly fruity odor reminiscent of overripe fruit and mushroom. It has a solvent-like sharpness on first sniff, softening to a slightly buttery green facet on dry-down.AI · claude-opus-4-7
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Perfume and Flavor Chemicals, page 200.
Colorless oily liquid
Almost insoluble in water, soluble in alcohol and oils
Powerful, grassy-green, pungent odor
Suggested for use in perfumes
Produced by condensation of Butyraldehyde with Acetone