Kyoto University of Education, Fushimi-ku, Kyoto 612, Japan * Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto 606, Japan ** Isotope Laboratory, Kyoto Prefectural University of Medicine, Kamigyo-ku, Kyoto 602, Japan *** Institute for Chemical Research, Kyoto University, Uji, Kyoto 611, Japan Received January 31, 1994 ... Syntheses of [I-13C]-2-butenedinitrile in a one-pot process and of pyridoxines regiospecifically multi- ...