How to make 8,1,2-closo-MC2B9 metallacarboranes

Wing Man, Sergey Zlatogorsky, Hugo Tricas, David Ellis, Georgina Margaret Rosair, Alan Jeffrey Welch

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Three examples of the rare 8,1,2-closo-MC2B9 isomeric form of an icosahedral metallacarborane have been isolated as unexpected trace products in reactions. Seeking to understand how these were formed we considered both the nature of the reactions that were being undertaken and the nature of the coproducts. This led us to propose a mechanism for formation of the 8,1,2-closo-MC2B9 species. The mechanism was then tested, leading to the first deliberate synthesis of an example of this isomer. Thus, deboronation of 4-(η-C5H5)-4,1,8-closo-CoC2B10H12 selectively removes the B5 vertex to yield the dianion [nido-(η-C5H5)CoC2B9H11]2–, oxidative closure of which affords 8-(η-C5H5)-8,1,2-closo-CoC2B9H11 in moderate yield.
Original languageEnglish
Pages (from-to)12222-12225
Number of pages4
JournalAngewandte Chemie International Edition
Issue number45
Publication statusPublished - 3 Nov 2014


  • icosahedron
  • isomers
  • Metallacarboranes
  • Structure
  • Synthesis


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