Isoeugenyl acetate (CAS number 93-29-8 for the isomeric mixture, or 5912-87-8 for the pure trans-isomer) is a highly valued phenylpropanoid ester, typically presenting as a white crystalline powder at room temperature,,. In the industry, it is produced semi-synthetically starting from natural eugenol extracted from clove essential oil. The manufacturing process involves the base-catalyzed isomerization of eugenol into isoeugenol, followed by acetylation using acetic anhydride, and finally fractional crystallization to achieve high purity,. Due to its crystalline nature and high stability, it is highly soluble in alcohol and fixed oils but completely insoluble in water.
In perfumery, isoeugenyl acetate is highly regarded for its nuanced and complex olfactory profile. It offers a sweet, mildly spicy aroma that blends the powdery floral notes of carnation (dianthus) with a warm balsamic and woody background,. The replacement of the hydroxyl group with an acetate ester makes this compound softer, sweeter, and less diffusive than its parent compounds isoeugenol or eugenol, effectively eliminating any sharp, medicinal, or dental-like harshness,. Notably, it acts as an exceptional fixative with a substantivity exceeding 400 hours on a smelling strip,. This makes it a perfect building block for adding warmth and depth to the heart and base notes of Oriental fragrances, masculine scents, and spicy floral accords,.
Beyond perfumery, isoeugenyl acetate is a familiar flavoring agent in the food industry. It delivers a smooth, sweet-spicy, woody, and subtle clove flavor,. This compound is particularly effective in replicating the flavors of berries (such as raspberries and strawberries), vanilla extracts, and traditional spiced baked goods like speculaas cookies. Used in very low concentrations (ranging from 0.44 ppm in non-alcoholic beverages to about 100 ppm in chewing gum), it provides a mellow spice background without overpowering the composition like raw clove oil might,.
Despite being an excellent raw material, the use of isoeugenyl acetate requires strict adherence to safety and dermatological regulations,. The compound acts as a "pro-hapten," meaning that upon skin contact, it can be enzymatically cleaved to release free isoeugenol, which may cause skin sensitization or allergic reactions in some individuals. Consequently, the International Fragrance Association (IFRA - 51st Amendment) has established stringent usage limits; for example, the maximum acceptable concentration is 0.99% in fine fragrances (Category 4) and 0.25% in leave-on body lotions applied with the hands (Category 5A). To maintain optimal quality, this ingredient must be stored in tightly closed containers in a cool, dry place, protected from direct light and heat sources,.
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