Umbelliferone (7-hydroxycoumarin) has a soft, sweet-hay coumarinic odor reminiscent of tonka and dried grass, with a mild powdery-herbaceous warmth. It is relatively weak and subtle on a blotter, contributing a diffuse, slightly balsamic sweetness rather than a pronounced top note.AI · claude-opus-4-7
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Perfume and Flavor Chemicals, page 1348.
Colorless crystals.
Soluble in hot water, poorly in cold water. Soluble in alcohol and in most oils.
Sweet-herbaceous, warm odor, very much resembling the odor of Coumarin, but not nearly as strong.
The material could still find use in perfume compositions as a supporting note for Galbanum and Opopanax, in which it increases the sweetness and fixative power, and the lactone blends very pleasantly with Oakmoss products.
1) from 2,4-Dihydroxybenzaldehyde plus Acetic anhydride by Perkin’s reaction. 2) from Resorcinol and Malic acid with Sulfuric acid in a Pechmann-synthesis.