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The potassium graphite reduction of R‘BBr3 (R‘ =: CN (2, 4, 6-Me3C6H2) CH2) in Et2O led to the isolation of 3 (R‘ (H) BB (H) R‘) and 4 (R‘ (H) 2B−B (H) 2R‘), with BB double and B−B single bonds, respectively. These compounds were characterized by single-crystal X-ray diffraction, 1H and 11B NMR, and elemental analyses. Neutral diborene 3 exhibits polymorphic planar (3a), twisted (3b), and trans-bent (3c) geometries in the solid state.
Wang et al. (Thu,) studied this question.
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