Author/Authors :
Yamamoto, Yoshihiko Nagoya University - Graduate School of Engineering - Department of Applied Chemistry, Japan , Kataoka, Hisashi Nagoya University - Graduate School of Engineering - Department of Molecular Design and Engineering, Japan , Kinpara, Keisuke Nagoya University, Chikusa, 464-8603, - Graduate School of Engineering - Department of Applied Chemistry, Japan , Nishiyama, Hisao Nagoya University - Graduate School of Engineering - Department of Applied Chemistry, Japan , Itoh, Kenji Nagoya University - Graduate School of Engineering - Department of Molecular Design and Engineering, Japan
Abstract :
In the presence of catalytic amounts of Cp*RuCl(cod), the [2 + 2 + 2] cycloaddition of 1,6-diyneswith ethynylferrocene proceeded at ambient temperature to afford ferrocenylbenzenes in 62-72% yields. An unsymmetrical 1,6-diyne bearing a ferrocenyl terminal was allowed to react with monoalkynes to give the corresponding meta-substituted cycloadducts selectively as single regioisomers. On the other hand, Bis(ferrocenyl)ruthenacyclopentatriene was formed from a diyne bearing a ferrocenyl group on both terminals and excess Cp*RuCl(cod).
Keywords :
Ruthenium catalysis , cyclotrimerization , diyne , ferrocenylalkyne , ferrocenylbenzene
