Gamma-Undecalactone

Moellhausen: Peach;

IFF: Sweet, fruity, peach-like

Gamma Undecalactone

Fraterworks: Gamma undecalactone (also incorrectly referred to as aldehyde c-14 as it is really a lactone and not an aldehyde) is the classic peach note for perfumes. it was discovered in 1908 and was first used as part of the key of the sweet persicol base in nuit de chine (1913) by maurice schaller for paul poiret's les parfums de rosine, but most famously a few years later as the key peach note (in the same persicol base) in mitsouko (1919) by jacques guerlain.
Undecalactone gamma can be used at 1% dilution to add a luscious and softening effect to a fragrance, and in higher doses (at 10% or pure) for a clearly peach-like quality. amounts under 1% are most common but there is no limit on this material and doses far higher are perfectly fine.
Below we present a number of demonstration formulas using persicol or undecalactone gamma. you can simply replace the persicol with around 80% of the same quantity in undecalactone gamma for a perfectly good result.

Aldehyde C14 So-Called

Symrise: Strong, fruity like peach and apricot

Undecalactone Gamma Coeur

IFF: Creamy, fruity, peach, coconut, lactonic

Gamma Undecalactone, Natural

Perfumer Supply House: A powerful, fruity (peach, apricot, coconut) aroma with creamy and fatty notes. it is widely used in minute amounts in perfume compositions such as orange blossom and honeysuckle.

Aldehyde C14 Peach (Gamma-Undecalactone)

Pell Wall Perfumes: Fruity-peach, creamy, fatty, lactonic, powerful
Arctander has quite a bit to say about gamma-undecalactone, including: “this 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. but it is not the kind of material ordinarily sold in drum-lots. however, after the success of a new perfume (type) in the 1950s, the title material had a further increase in popularity, when numerous perfumers used it at unusually high levels along with new non-nitro musk chemicals, in order to duplicate part of the new note in the successful perfume. the author has yet to see a duplication which sells better than the original (in perfumes), but it must be admitted that undecalactone drew benefit from this popularity. lt 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, etc. concentrations far below 1% are effective, and it is at times possible to ruin a fragrance with 0.1 or 0.2% of the title material, just as well as it is possible to double the floral sweetness and depth of another fragrance with that amount of undecalactone. the material was originally used in violet perfumes, so popular at the time of discovery of this lactone (about 1900). but 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.”

Gamma-Undecalactone (Aldehyde C-14) ≥97.0%, FCC, Kosher

Bedoukian Research: A fruity, peachy character with a melon rind undertone
Blends well with isoeugenyl acetate, dimethyl benzyl carbinol, cocodescol, madescol and gamma nonalactone.