The preparation of cyclopentadecanone and cyclopentadecanolide from Malania oleifera Chum oil
The macrocyclic musks are of central importance in the fragrance industry. The preparation of cyclopentadecanone and cyclopentadecanolide from Malania oleifera Chum oil were investigated. Preparation method of cyclopentadecanone is three steps process: first fatty acid double bonds of Malania oleifera Chum oil are cut off by ozonolysis; second ozonides are converted into methyl esters by esterification; afterwards cyclopentadecanone was achieved from through acyloin condensation, reduction and separation with 38.5 % overall yield. The preparation coyfclopentadecanolide is two step process: first by ozonolysis triglycerides of {omega}-hydroxycarboxylic acids synthesized from malania oleifera chum oil by ozonolysis; and it were catalytically transformed to macrocyctic lactones, and a 63% yield of cyclopentadecanolide was obtained. The effect of different ester groups on cyclization of ,{omega}-difatty acid alkyl ester, and effect of catalysts on cyclization of {omega}-hydroxycarboxylic acid triglyceride were investigated.