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A slightly distorted trigonal bipyramidal geometry is seen in the first fully characterized five-coordinate hypervalent boron compounds (2; Ch=O, S; X=H, OMe). Lithiation of the new versatile tridentate ligand precursor 1 bearing an anthracene skeleton followed by the addition of a B-chlorocatecholateborane enabled three examples of 2 to be isolated and their structures to be determined by X-ray analysis.
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Yamashita et al. (2000) studied this question.
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