title: Synthesis and structure of 1-zirconacyclopent-3-yne complexes without substituents adjacent to the triple bond.
abstract: Five-membered metallacyclic alkynes that have no substituents adjacent to the triple bond have been synthesized, isolated, and structurally characterized. Zirconocene dichlorides, Cp'2ZrCl2 (Cp' = C5H5, C5H4-t-Bu), reacted with 1,4-dichlorobut-2-yne in the presence of magnesium to give 1-zirconacyclopent-3-yne compounds (5 (a) Cp' = C5H5, (b) Cp' = C5H4-t-Bu) that have a -CH2CCCH2- moiety in good yields. They are stable enough to be isolated in a pure form, despite the absence of substituents. 5a reacted with an equimolar amount of Cp2Zr(but-1-ene)(PMe3) to produce a bimetallic complex in which the zirconacyclopentyne coordinates to the other zirconocene moiety as an alkyne.
authors.affiliation: RIKEN, Wako, Saitama 351-0198, Japan. nsuzuki@riken.jp
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Suzuki
authors.forename: Naoto
authors.initials: N
authors.lastname: Aihara
authors.forename: Hidemichi
authors.initials: H
authors.lastname: Takahara
authors.forename: Takaaki
authors.initials: T
authors.lastname: Watanabe
authors.forename: Masakazu
authors.initials: M
authors.lastname: Iwasaki
authors.forename: Masahiko
authors.initials: M
authors.lastname: Saburi
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hashizume
authors.forename: Teiji
authors.initials: T
authors.lastname: Chihara