Patent No. EP3672692 (titled "Blends Containing Enantiomerically Pure Ambrocenide(R)") was filed by Symrise on Aug 25, 2017. The application was issued on Aug 16, 2023.
The invention provides a mixture comprising compound (Ia) and containing less than 0.01 wt.% of compound (Ib), and preferably compounds (Ic) and/or (Id), based on total mixture weight. Compound (Ia) is identified as the primary odorically active component of Ambrocenide®. The mixture may further include compounds of formulas (II) through (VI). It is used in fragrance compositions (e.g., perfume oils) and perfumed products (e.g., detergents, cosmetics, air fresheners) to impart, modify, or enhance olfactory notes—specifically flowery, amber, woody, musk, violet, citrus, and aldehyde—or to mask unpleasant odors. The mixture is produced by reacting $\alpha,\alpha$-cedranediol (IIIa) with dimethoxypropane, where the starting material contains less than 0.01 wt.% of $\beta,\beta$-cedranediol (IIIb) and preferably (IIIc) and/or (IIId).
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