title: Cationic rhodium(I)/segphos-catalyzed cycloisomerization of 1,6- and 1,7-diynes in the presence of 1,2-cyclohexanedione.
abstract: We have developed the first catalytic cycloisomerization of 1,6- and 1,7-diynes leading to trienes and vinylpyrroles by using a cationic rhodium(I)/Segphos complex (2.5-10 mol %) and 1,2-cyclohexanedione (100 mol %). 1,2-Cyclohexanedione may effectively occupy vacant coordination sites and thus promote the present cycloisomerization.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan. tanaka-k@cc.tuat.ac.jp
authors.forename: Ken
authors.initials: K
authors.lastname: Tanaka
authors.forename: Yousuke
authors.initials: Y
authors.lastname: Otake
authors.forename: Masao
authors.initials: M
authors.lastname: Hirano