Gamma-Undecalactone, with CAS number 104-67-6, is a synthetic aroma chemical known for its creamy, fruity, and slightly floral character, reminiscent of peach and coconut. It is commonly used in perfumery to impart a smooth, velvety texture to compositions, often found in fruity and floral accords. This compound typically sits in the heart or base of a fragrance formula, where it can enhance the overall richness and complexity of the scent. Gamma-Undecalactone is valued for its ability to blend well with other ingredients, making it a versatile choice for perfumers. In terms of safety and regulatory considerations, it is important to note that Gamma-Undecalactone may be subject to specific usage restrictions under IFRA guidelines, particularly in certain applications. As with many synthetic aroma chemicals, it is advisable for formulators to consult the latest safety data and regulatory information to ensure compliance and safe usage in cosmetic products. — AI-generated summary, 2026-09-02.
A rich, oily peach-skin aroma with a creamy, milky lactonic character. Sweet and slightly waxy, with hints of apricot and coconut in the drydown. Classic 'peach lactone' used to give fruity depth and roundness.AI · claude-opus-4-7
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Other ingredients whose composition declares this material as a constituent. The percentage shown is the supplier-declared concentration in that parent.
| Ingredient | % | Range |
|---|---|---|
| PERSICOL (PEACH BASE) | — | 25–…% |
| CHAMPAGNE | — | 5–10% |
| CHAMPAGNE FRAGRANCE | — | 5–10% |
| CANDY CANE | — | 1–5% |
| PRUNOL SP | — | 1–5% |
| PASSION FRUIT BASE 109223 | — | 1–2.5% |
| PRUNELLA | — | 1–2.5% |
| APPLE | — | — |
| BANANA | — | — |
| DAIRY | — | — |
Perfume and Flavor Chemicals, page 1350.
Almost colorless or very pale straw-colored, slightly viscous liquid.
Practically insoluble in water, soluble in alcohol and oils, and in aqueous alkali.
Sweet, oily-fruity, Peach-like taste in concentrations lower than 20 ppm. The effect at higher concentrations is not unpleasant, but strongly fruity, supporting other fruity notes, necessarily present at high concentration of the Lactone.
The material is widely used, although in minute amounts, in perfume compositions. In order of frequency in use, it ranks very high among the materials on the perfumer’s shelf.
It blends excellently with Nonalactone in Gardenia and Tuberose, and in many versions of Lilac bases. It extends the depth of an Orangeblossom often too harsh with conventional materials, and it is a frequent component of Honeysuckle.
Its most important use today is in flavors, primarily in imitation Peach, but also in many fruity types, often as a fixative for the very volatile fruit esters.
1) By lactonization of undecylenic acid with sulfuric acid. This process will yield minor amounts of delta-isomer. 2) From Octanol-l plus Methylacrylate, with Di-tertiary-Butylperoxide. 3) From Heptyl-ethylene oxide plus Sodio-malonic ester.