... C The Chemical Society of Japan 1980 CONVENIENT PREPARATION OF 1,2- CYCLOHEXANEDIONES Masanori UTAKA, Seishiro MATSUSHITA, and Akira TAKEDA Department of Synthetic Chemistry, School of Engineering ... However, it is better to use a nitrogen atmosphere in order to prevent the base-catalyzed autoxidation or coloration of the product. See M. Utaka, S. Matsushita, H. Yamasaki, and A. Takeda, Tetrahedron Lett., 1980, 1063. ...