Add time:09/26/2019         Source:sciencedirect.com

Publisher SummaryThis chapter focuses on boron-11 nuclear magnetic resonance (NMR) spectroscopy. The theoretical considerations of boron-11 chemical shifts are presented in the chapter. Tercovalent boron compounds, including substituted boron halides and aminoboranes are described in the chapter. Later, the association of tercovalent boron compounds is discussed in this chapter. The chapter also describes tetra-covalent boron compounds. Boron heterocycles can be divided into two distinct fields, the effect of ring strain on the 11B shift and the correlation of aromaticity with the shift. The 11B chemical shift of borazoles has been investigated by several groups of workers and some of the shifts have been discussed in a review on boron-nitrogen compounds. In the co-ordination compounds of boron, some of the most conflicting results have been obtained. It is, however, generally recognized that the transformation of the sp2 hybridization of the boron atom to a sp3 hybridized state on complex formation results in a shift to high field. The complexes of boranes and boron trihalides, with simple phosphorus compounds, are extensively investigated, possibly because of the presence of 11B-31P coupling.

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