Powdery, velvety, slightly animalic. Ambretone smells like warm skin pressed against clean linen left in the sun — a musky envelope with a faint nitro-musk shadow that modern polycyclics cannot replicate.
Intensely powdery, with a sweet, velvety musk character that recalls pressed cott on and warm skin. More floral and less animalic than muscenone, but with a subtle civet-like undertow absent from polycyclic musks like Galaxolide. There is a faint nitro-musk reminiscence — a dusty, almost cosmetic sweetness — that gives ambretone its particular old-world musk quality. Drier than Ethylene Brassylate, rounder than Exaltolide, and significantly more textured than Helvetolide.
Evolution over time
Immediately
Immediately
Sweet, powdery musk with a faint metallic-cosmetic edge. Almost lipstick-like, with a soft animalic warmth underneath.
After a few hours
After a few hours
The nitro-musk reminiscence fades. What remains is a velvety, textile-like warmth — clean linen left on warm skin. Slightly ambery, with a quiet persistence.
After a few days
After a few days
A bare-skin whisper. Smooth, warm, almost imperceptible but still present on fabric. The powdery character has settled into something closer to body heat than fragrance.
The Full Story
Ambretone is a 16-membered macrocyclic ketone musk, chemically (5Z)-cyclohexadec-5-en-1-one (CAS 37609-25-9, C₁₆H₂₈O, MW 236.39). It belongs to a small family of unsaturated macrocyclic ketone musks alongside muscenone and cosmone, but occupies a distinct olfactory niche: sweeter, more powdery, and closer to the vanished nitro-musks than any polycyclic alternative. Where muscenone reads dry and animalic, ambretone adds a velvety, almost textile quality — the memory of musk ambrette without the neurotoxicity.
The synthesis proceeds from cyclododecanone: chlorination gives 2-chlorocyclododecanone, which reacts with two equivalents of vinyl magnesium chloride to yield 1,2-divinylcyclododecan-1-ol, then undergoes an oxy-Cope rearrangement to produce the 16-membered ring. The commercial product is a mixture of Z and E isomers. Physical properties: density 0.93, boiling point 296–300°C at atmospheric pressure (120°C at 1 mmHg), flash point 166°C, refractive index 1.487–1.491.
In formulation, ambretone functions primarily as a fixative and volume builder. Typical dosage in fine fragrance runs 0.1–5%. It excels in floral-musky accords, skin-scent compositions, and any formula that requires a soft, persistent radiance without the metallic edge of Galaxolide or the laundry-clean character of Habanolide. It bridges well between amber bases and white florals, lending body to jasmine and tuberose accords. Its high logP (calculated ~6.5) ensures strong substantivity on fabric and skin.
Australian industrial chemical assessments have classified ambretone as potentially bioaccumulative (calculated BCF above 2000 L/kg), though OECD 301F testing showed 86% mineralisation within 28 days, meeting the ready biodegradability threshold. IFRA does not currently restrict its use.
This note in Première Peau. Doppel Dänçers · Albâtre Sépia. Sample all seven extraits in the Discovery Set.
Ambretone's synthesis relies on an oxy-Cope rearrangement — a [3,3]-sigmatropic reaction that thermally expands a 12-membered ring into a 16-membered one in a single concerted step. The same class of pericyclic reactions is governed by the Woodward-Hoffmann rules on orbital symmetry, which earned Roald Hoffmann the 1981 Nobel Prize in Chemistry.
Extraction & Chemistry
Extraction method: Fully synthetic. Synthes is starts from cyclododecanone via chlorinati on to 2-chlorocyclododecanone, Grignard reacti on with two equivalents of vinyl magnesium chloride to produce 1,2-divinylcyclodode can-1-ol, then oxy-Cope rearrangement to form the 16-membered macrocyclic ketone ring. The commercial material is a mixture of (5Z) and (5E) isomers. No natural extracti on exists — although the name carries ambrette seed, ambretone is not isolated from Abelmoschus moschatus.
Ambretone is a base-note fixative and volume builder. Its primary function is to anchor volatile top and heart notes while radiating a soft, powdery musk sillage. At 0.1-2% it contributes warmth and body without asserting itself; at 3-5% it becomes a structural pillar, projecting a velvety skin-musk halo. The molecule is indispensable in fragrance families that depend on musky persistence: skin scents, soft florals, powdery orientals, and clean-skin accords. It pairs particularly well with Iso E Super (for transparent woody-musk effects), Hedione (for jasminic lift against a musky bed), and ambroxide (for a denser amber-musk foundation). Ambretone outperforms polycyclic musks in terms of textural depth — where Galaxolide reads flat and clean, ambretone reads dimensional and intimate. It shares functional territory with muscenone but is sweeter, less aggressively animalic, and better suited to feminine and unisex compositions.
