Building a picture of heteroborane isomerisation: Synthesis and characterisation of the 10-(dialkylsulfane)-7,8-diphenyl-7,8-dicarba-nido-undecaboranes 7,8-Ph2-10-L-7,8-nido-C2B9H10 (L = SMe2, SMeEt, SEt2) and of intermediate and isomerised products arising from metallation of the first of these

Shirley Dunn, Rhona M. Garrioch, Georgina M. Rosair, Lorraine Smith, Alan J. Welch

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Three new, substituted, nido carboranes, 7,8-Ph2-10-(SMe2)-7,8-nido-C2B 9H10 (1a), 7,8-Ph2-IO-(SMeEt)-7,8-nido-C2B9H1o (1b) and 7,8-Ph2-10-(SEt2)-7,8-nido-C2B 9H10 (1c) have been synthesised and characterised, including a crystallographic study of the first. Deprotonation of 1a followed by treatment with (MeCN)2(CO)2MoBr(p-C3H5) at 0 °C affords the non-icosahedral 1,2-Ph2-4-(SMe2)-5-(p-C3H 5)-5,5-(CO)2-5,1,2-closo-MoC2B 9H8 (2a), which on subsequent warming transforms into icosahedral 2,8-Ph2-5-(SMe2)-1-(p-C3,H 5)-1,1-(CO)2-1,2,8-closo-MoC2B 9H8 (3a). It is argued that under the conditions of these rearrangements the B-S bond is likely to remain intact, and consequently that the identity of the SMe2-labelled boron atom in 3a affords useful experimental information on the course of the isomerisation.

Original languageEnglish
Pages (from-to)1013-1027
Number of pages15
JournalCollection of Czechoslovak Chemical Communications
Volume64
Issue number6
Publication statusPublished - 1999

Keywords

  • Carboranes
  • Crystal structure
  • Isomerisation
  • Metallacarboranes, Molybdenacarboranes
  • NMR spectroscopy, 1H, 11B
  • X-ray diffraction

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