A powerful, penetrating green-fatty aldehyde with a sharp, oily-herbaceous character reminiscent of crushed leaves, cucumber peel, and rancid nut oil. In extreme dilution it turns cleaner and more natural — evocative of fresh violet leaf, galbanum, and unripe fruit skins. Overdosed it becomes aggressively pungent and tallowy.AI · claude-opus-4-7
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Perfume and Flavor Chemicals, page 624.
Colorless mobile liquid.
Almost insoluble in water, soluble in alcohol, miscible with oils.
Pungent-green odor, only in extreme dilution becoming pleasant, vegetable-juicy-green, but more fatty than the Hexenoic aldehydes.
This aldehyde, not nearly as popular as the Hexenoic series, has been suggested for use in perfumes (and flavors). It can be used in the reconstruction of Galbanum (oil) notes, or separately in minute amounts to accompany Geranium or fruity-floral topnote complexes, fruity-herbaceous notes, etc. It is somewhat more difficult to use than the Hexenal.
1) by condensation of Acetaldehyde with n-Valeric aldehyde 2) by reduction of 2-Heptenoic acid with Formic acid vapors over Manganous oxide at 350° C 3) by oxidation of 2-Hepten-1-ol.