Description and usage notes:
This is a very high quality of methyl ionone iso (often called gamma-Methyl Ionone), broadly equivalent to the Givaudan product Cetone Alpha and the IFF product Methyl Ionone Gamma Pure, but generic.
Arctander says of this material: “The odor of this isomer is generally considered more attractive than any other Methylionone, perhaps with the exception of the beta-iso-Methylionone, so-called delta-Methylionone.
It is extremely versatile in character, and effects ranging from sweet floral to tobacco-like or woody are obtainable with various grades of subject material. The most refined grades, which are quite expensive, often show a very attractive ‘creamy’ top-note and a most uniform, powdery-sweet dryout performance. This type of Methylionone can support floral notes in Ylang-Ylang as well as woody notes in Vetiver, or leathery notes in Salicylates, etc.
Certain types of perfume contain up to 25% or more of this material. Many soap perfumes are based upon a large volume of common-grade Methylonone with the subject isomer as pre-dominant component.”
Calkin & Jellinek talk about Methyl Ionone: “Methyl ionone is one of the most versatile materials used in perfumery. Although it occurs in a number of different isomeric forms … the qualities most widely used today are either the gamma (iso-alpha) form or a mixture of isomers in which this predominates. In odor it lies somewhere between floral, woody, and iris, working in a perfume as a bridge between the middle and base notes. It blends with almost every type of material, taking its place as a structural component in many of the great perfume families.”