13-Hvdroxy-2-oxotridecane, which is isolated from extract of Evodia hupehensis Dode honey-bee eggs and actively attracts honey bees, is synthesized via ozonolysis of 1-methylcyclododecene and tetradec-13-en-2-one, the product from monoalkylation of the acetoacetic ester with 1-bromo-10-undecene followed by decarbethoxylation, with further reduction of the intermediate peroxides using NaBH(OAc)(3).