Abstract:
The present invention relates to: a fragrance composition containing (3S)-(6E)-2,3-dihydrofarnesal having a chemical purity of 90 mass% or more and an optical purity of 50% e.e. or more; a cosmetic product containing the fragrance composition; and a method for improving an aroma using the fragrance composition.
Abstract:
Trimethylcyclohexane derivatives represented by general formula (1): wherein A represents C=O or CH-OH; n is 2; R represents hydrogen or methyl; R represents linear or branched and optionally saturated C3-10 hydrocarbyl; and the dotted line represents an optionally saturated carbon-carbon bond; melanin-formation inhibitors and perfume-holding agents containing one or more of the above derivatives, and skin preparations for external use characterized by containing one or more melanin-formation inhibitors and/or perfume-holding agents described above.
Abstract:
A process for producing muscone by methyl addition to the 1,4-conjugation of 2-cyclopentadecenone. By the process, muscone is produced in high yield not under reaction conditions including an extremely low temperature and a low concentration but under practical conditions. The process comprises subjecting 2-cyclopentadecenone to a 1,4-conjugation addition reaction with an organometallic methylation reagent in the presence of a copper catalyst or nickel catalyst and an enol anion-trapping agent to obtain a 3-methyl-1-cyclopentadecene derivative represented by the general formula (II): (II) and then solvolyzing the enol moiety of this 3-methyl-1-cyclopentadecene derivative to obtain muscone.