Alpha-Isomethyl Ionone

Alpha-Isomethyl Ionone is a synthetic musk-violet fragrance ingredient with a soft, powdery, woody-floral scent profile reminiscent of orris root and violet, making it one of the most widely used fragrance materials in fine perfumery and cosmetics. It is produced by the acid-catalyzed cyclization of pseudoionone, a condensation product of acetone and citral, and is classified as an allergen under EU Cosmetics Regulation No. 1223/2009, requiring mandatory labeling at concentrations above 0.001% in leave-on products and 0.01% in rinse-off products. Formulators value it for its excellent tenacity, skin-substantivity, and its ability to impart a clean, elegant powdery note that blends seamlessly with musks, florals, and woody accords across a broad range of product types.