title: Reversible haptotropic shift in zirconocene-hexapentaene complexes.
abstract: Low-valent zirconocene species reacted with 1,1,6,6-tetraalkyl-1,2,3,4,5-hexapentaenes to form both 1-zirconacyclopent-3-ynes and eta2-pi-coordinated complexes according to the alkyl groups (R) and the existence of the neutral ligand (L). Haptotropic interconvertion between these two complexes was observed. It was proposed that double insertion of isocyanide into the Zr-C bond of 1-zirconacyclopent-3-ynes takes place via the isocyanide adduct of the eta2-pi-complex as an intermediate.
authors.affiliation: Advanced Technology Support Division, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Suzuki
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hashizume
authors.forename: Hajime
authors.initials: H
authors.lastname: Yoshida
authors.forename: Meguru
authors.initials: M
authors.lastname: Tezuka
authors.forename: Keisuke
authors.initials: K
authors.lastname: Ida
authors.forename: Sayoko
authors.initials: S
authors.lastname: Nagashima
authors.forename: Teiji
authors.initials: T
authors.lastname: Chihara