Alpha-Isomethyl Ionone carries a soft, powdery-floral scent with nuances of violet and orris root. It is valued for lending a velvety, airy floral note to compositions and can also impart subtle woody undertones, often used in both floral and powdery blends.
Scent Profile
Alpha-Isomethyl Ionone presents a powdery, violet-like floral scent with subtle woody and faintly fruity undertones. Its aroma is soft, persistent, and gently sweet, evoking the impression of violets and iris. Over time, it maintains its floral character while revealing a creamy, woody depth.
Held on CAS 127-51-5, under a slug that IS the bare CAS because the source gave no usable name. The claim 'we hold other ionone derivatives but not this one' was false. Corrected 2026-08-18 by re-running the identity ladder over every material_not_held edge.
Declarable allergen
Named in EU Annex III as alpha-Isomethyl iononeproducts must list this name above a set concentration
Restricted
An IFRA Standard limits how much of this a perfumer can usethe limit applies to the perfumer, not the wearer
These are facts about the substance, not about any perfume with this note.
Why that matters
A perfume that names Alpha-Isomethyl Ionone can use a different extract, a
reformulated version, or a synthetic reconstruction. It can also hold less
than the amount that requires a declaration. We cannot tell which applies.
These rows cover only the substances we hold a link for.
This ingredient is a synthetic compound belonging to the ionone family, originally inspired by the scent molecules found in violets. It is produced through chemical synthesis from citral or other terpene sources, making it widely available for perfumery use.
Usage in Perfumery
Perfumers use Alpha-Isomethyl Ionone primarily in the heart and base of floral compositions to impart softness, volume, and longevity. It blends well with other floral notes, woods, musks, and powdery accords, and is often employed to reinforce or simulate violet and iris effects.
A selection of reviewed perfumes where Alpha-Isomethyl Ionone appears prominently.
No perfumes featuring this note have been reviewed yet. Check back soon.
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