Ring expansion of a platinacyclopropane to a platinacyclopentane by double insertion of isocyanides into Pt-C bonds

Kazuhiro Tsuchiya, Hideo Kondo, Hideo Nagashima

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Abstract

A platinum isocyanide complex bearing a η2-TCNE ligand, (η2-TCNE)Pt(η-CNC6H3-2,6-Me 2)2 (1), was synthesized, and its crystallographic study revealed the coordination mode of the η2-TCNE ligand to be a typical metallacyclopropane extreme, in which back-donation from metal to TCNE contributes primarily to the stabilization of 1. Treatment of 1 with 2 equiv of CNC6H3-2,6-Me2 resulted in ring expansion of the platinacyclopropane by insertion of CNC6H3-2,6-Me 2 into each Pt-C bond of the metallacycle, leading to formation of a new complex having a platinacyclopentane structure, (TCNE)Pt(η-CNC 6H3-2,6-Me2)4 (4). Although the molecular structures of palladium and nickel homologues of 1 were close to the corresponding metallacyclopropane, no metallacyclopentane complex was obtained under similar conditions. Studies on variable-temperature NMR spectroscopy and spin-saturation transfer measurement of 4 showed exchange of the imidoyl CNC6H3-2,6-Me2 group and the coordinated CNC6H3-2,6-Me2 ligand in solution, suggesting the ring expansion to be reversible.

Original languageEnglish
Pages (from-to)1044-1051
Number of pages8
JournalOrganometallics
Volume26
Issue number4
DOIs
Publication statusPublished - Feb 12 2007

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All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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