We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.

Durham Research Online
You are in:

Synthesis of isomeric B-methylated tantalum carboranes, (Me2N)(3)TaC2B9H10Me.

Fox, M. A. and Howard, J. A. K. and Hughes, A. K. and Yufit, J. M. MalgetD. S. (2001) 'Synthesis of isomeric B-methylated tantalum carboranes, (Me2N)(3)TaC2B9H10Me.', Journal of the Chemical Society : Dalton transactions. (15). pp. 2263-2269.


The cage-alkylated metallacarborane complex [4,4,4-(NMe2)(3)-3- Me-4,1,2-closo-TaC2B9H10] 8, is obtained as the only product from the reaction of Ta(NMe2)(5) with nido-11-Me-2,7-C2B9H12 4, which is prone to skeletal rearrangement under basic conditions. That no rearrangement occurs indicates that the hydroamminolysis reaction is a clean synthetic method. The isomeric metallacarboranes [3,3,3-(NMe2)(3)-4-Me-3,1,2-closo- TaC2B9H10] 9 and [2,2,2-(NMe2)(3)-3-Me-2,1,7-closo-TaC2B9H10] 10 are produced from the reaction of Ta(NMe2)(5) with [Me3NH][nido-9-Me-7,8-C2B9H11] 5 and [Me3NH][nido-8-Me-7,9- C2B9H11] 6 respectively. Identities of the metallacarboranes 8, 9 and 10 are deduced by detailed multinuclear (B-11, C-13 and H-1) NMR spectroscopy. These geometries are supported by boron NMR shift predictions based on observed shifts of the known non-methylated analogues [3,3,3-(NMe2)(3)-closo-3,1,2- TaC2B9H10] 1 and [3,3,3-(NMe2)(3)-closo-3,1,2-TaC2B9H10] 2 and calculated shifts (GIAO-B3LYP/6-311G*//MP2/6-31G*) of the B- methyl carboranes, closo-3-Me-1,2-C2B10H11 11, 4-Me-1,2- C2B10H11 12 and 2-Me-1,7-C2B10H11 13. The molecular structure of 8 has been determined by X-ray diffraction.

Item Type:Article
Full text:Full text not available from this repository.
Publisher Web site:
Record Created:20 Apr 2007
Last Modified:20 Nov 2014 10:43

Social bookmarking: del.icio.usConnoteaBibSonomyCiteULikeFacebookTwitterExport: EndNote, Zotero | BibTex
Look up in GoogleScholar | Find in a UK Library