Nine 10-arylidene anthrones were synthesized from anthrone and aryl aldehydes in xylene using pyridine as catalyst and p-t-butylphenol as an antioxidant. The hi
(±)-Frontalin (1,5-dimethyl-6,8-dioxabicycl octane), an aggregation pheromone of bark beetle, was prepared from cyclohexanone via a key intermediate 6-hepten-2