1-Me 2NH-2-CH 2Cl- closo-l-CB 11H 10. An unusual product from the insertion reaction of Me 2NBCl 2 with Li 2 [7-Me 3N- nido-7-CB 10H 10

Abstract

The boron insertion reaction of Me 2NBCl 2 with Li 2[7-Me 3N- nido-7-CB 10H 10] gave new neutral compound, 1-Me 2N(H)-2-CH 2Cl- closo-l-CB 11H 10. The reaction is thought to proceed via a metathetical insertion of Me 2NBCl 2 into the nido-carborane dianion, accompanied by demethylation of the 7-dimethylamine group and methylene insertion into the B-N bond of the inserted reagent, with concomitant protonation of its nitrogen. Nucleophilic-displacement of dimethylamine by chloride ion and protonation of the C-NMe 2 group then gives the observed product, which was characterised by multinuclear NMR spectroscopy and X-ray crystallography.