The valuable odoriferous material 2-n-pentyl-3-(2-oxopropyl)-1-cyclopentanone is prepared by a process which comprises hydrolysing and decarboxylating a compound of the formula ##STR1## wherein R represents a hydrocarbyl group, with water under pressure and in an initially substantially neutral medium. The use of 2-n-pentyl-3-(2-oxopropyl)-1-cyclopentanone as an odorant is also disclosed.
Enantioselective synthesis and absolute stereochemistry of both the enantiomers of trans-magnolione, a fragrance structurally related to trans-methyl jasmonate
Both enantiomers of the trans stereoisomer of magnolione 4 have been prepared by asymmetric Michael addition of ethyl acetoacetate to 2-pentylcyclopentenone, followed by hydrolysis/decarboxylation. The Michael reaction occurs under solid/liquid phase transfer catalysis in the presence of N-methylanthracenylquininium (or quinidinium) chloride. Enantiomeric excesses up to 76% are obtained. The trans
Perfumed compositions which may, and in most cases especially do, contain one or more odorant perfume ingredients in conjunction with up to 20%, by weight of said perfumed compositions, of the compound 2-n-pentyl-3-(2-oxopropyl)-1-cyclopentanone which is free from garlicky odors and which has a magnolia or magnolia-like odor, and which possesses the property of imparting a magnolia odor to such perfumed and odorant compositions.