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The geometric consequences of CY hyperconjugation in an uncharged system YCX (shortening of the CX bond, lengthening of the CY bond, decrease in the YCX angle) were revealed by carrying out an X-ray structure analysis of the C-borylborirene 1. The structural parameters are in surprisingly good agreement with those obtained for orthogonal 2 by ab initio calculations (Dur = 2,3,5,6-tetramethylphenyl).
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Höfner et al. (1989) studied this question.
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