Synthesis of 29-Hydroxy-3, 11-Dimethyl-2-nonacosanone, Sex Pheromone of the German Cockroach

29-Hydroxy-3, 11-dimethyl-2-nonacosanone, one component of the sex pheromone of the German cockroach, was synthesized. The synthetic compound was equivalent in the biological activity for the male to raise his wings to the natural one and was much more active than 3, 11-dimethyl-2-nonacosanone which was another component of the pheromone.