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.
|Number of pages||15|
|Journal||Collection of Czechoslovak Chemical Communications|
|Publication status||Published - 1999|
- Crystal structure
- Metallacarboranes, Molybdenacarboranes
- NMR spectroscopy, 1H, 11B
- X-ray diffraction