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

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

Journal Name: Letters in Organic Chemistry

Volume 2 , Issue 3 , 2005

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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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Article Details

Year: 2005
Page: [219 - 221]
Pages: 3
DOI: 10.2174/1570178053765258
Price: $65

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