The signature aroma chemical of grapefruit — a juicy, tart citrus with a distinctive bitter-woody undertone. Unlike bright citrus terpenes it has a fuller, more rounded body and a slightly sulfurous, peel-like edge that gives grapefruit accords their characteristic depth and persistence.AI · claude-opus-4-7
Composition, IFRA restriction figures, allergen concentrations and where this material is bought are part of Perfume Foundry’s curated library and need an account. Create one or sign in.
Perfume and Flavor Chemicals, page 1034.
Almost colorless, or pale yellowish oily liquid when pure. Some commercial grades are orange-colored, slightly viscous.
Practically insoluble in water, soluble in alcohol and oils.
The title material has an extremely powerful fruity, sweet and citrusy odor of good tenacity.
Nootkatone has a pleasant taste in concentrations lower than 50 ppm, and although preliminary reports indicate that the material has a perceptible flavor down to 1 ppm, the author is inclined to claim that the minimum perceptible for Nootkatone is between 0.1 and 0.2 ppm.
The title ketone could undoubtedly find use in perfume compositions for novel effects in topnote compositions, particularly in combination with Bergamot oil, Bitter Orange oil, Hexenyl esters, Aldehydes, etc.
The interesting fact is that the material has a typical Grapefruit peel taste at levels higher than 3 ppm and lower than 50 ppm.
The sesquiterpene Valencene is isolated from Orange juice oil and oxidized with tertiary-Butyl chromate to yield the title ketone.