Synthesis of<i>cis</i>-12-Nonadecen-9-one,<i>cis</i>-13-Icosen-10-one, the Pheromone of Peach Fruit Moth, and<i>cis</i>-15-Henicosen-11-one, the Pheromone of Douglas Fir Tussock Moth
A convenient synthesis of cis-12-nonadecen-9-one (4a), cis-13-icosen-10-one (4b), the pheromone of peach fruit moth, and cis-15-henicosen-11-one (4c), the pheromone of Douglasfirtussockmoth, is described. 4a was synthesized from methyl 3-oxoundecanoate and 1-bromo-2-nonyne (2a) via 12-nonadecyn-9-one. The higher homo-log 4b could be obtained from methyl-3-oxododecanoate and 2a. Similarly, 4c was