Chevtchouk, T., V. Isakov, and O. Kulinkovich. 1999. Preparation of ketones from esters via substituted cyclopropanols. Application to the synthesis of (+-)-ipsenol, (+-)-ipsdienol and amitinol, the components of aggregation pheromones of the Ips bark beetles. Tetrahedron 55(46): 13205-13210.