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Letters in Organic Chemistry

Editor-in-Chief

ISSN (Print): 1570-1786
ISSN (Online): 1875-6255

Synthesis of Ferrocenylbenzenes via Cp*RuCl-Catalyzed Partially Intramolecular Cyclotrimerization of Ferrocenylalkynes

Author(s): Yoshihiko Yamamoto, Hisashi Kataoka, Keisuke Kinpara, Hisao Nishiyama and Kenji Itoh

Volume 2, Issue 3, 2005

Page: [219 - 221] Pages: 3

DOI: 10.2174/1570178053765258

Price: $65

Abstract

In the presence of catalytic amounts of Cp*RuCl(cod), the [2 + 2 + 2] cycloaddition of 1,6-diynes with 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


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