title: Homogeneous asymmetric catalysis in fragrance chemistry.
abstract: Opposite enantiomers of a chiral fragrance may exhibit different olfactory activities making a synthesis in high enantiomeric purity commercially and scientifically interesting. Accordingly, the asymmetric synthesis of four chiral odorants, Fixolide, Phenoxanol, Citralis, and Citralis Nitrile, has been investigated with the aim to develop practically feasible processes. In the devised synthetic schemes, the key step that leads to the formation of the stereogenic center is the homogeneous asymmetric hydrogenation of a prochiral olefin. By an appropriate choice of the catalyst and the reaction conditions, Phenoxanol, Citralis, and Citralis Nitrile were obtained in high enantiomeric purity, and odor profiles of the single enantiomers were determined.
authors.affiliation: Dipartimento di Chimica, Università di Venezia, Calle Larga S. Marta, 2137, I-30123 Venice. alessandra.ciappa@nicosinternational.it
authors.forename: Alessandra
authors.initials: A
authors.lastname: Ciappa
authors.forename: Sara
authors.initials: S
authors.lastname: Bovo
authors.forename: Matteo
authors.initials: M
authors.lastname: Bertoldini
authors.forename: Alberto
authors.initials: A
authors.lastname: Scrivanti
authors.forename: Ugo
authors.initials: U
authors.lastname: Matteoli
mesh_terms: D002384:Catalysis; D002625:Chemistry, Organic / Q000379:methods; D006865:Hydrogenation; D015394:Molecular Structure; D009812:Odorants / Q000032:analysis*; D010476:Perfume / Q000737:chemistry*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D010476:Perfume