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The syntheses and molecular structures of four compounds are reported: 1 (RBBr3), 2 (R (H) 2B−B (H) 2R), 3 (R (H) BB (H) R), and 4 (RBH3) (R =: CN (2, 6-Pri2C6H3) CH2). These compounds were characterized by single-crystal X-ray diffraction, 1H and 11B NMR, and elemental analyses. Compounds 2 and 3 were prepared by the KC8 reduction of 1 in Et2O. Compound 3 is the first structurally characterized neutral diborene (mean BB: 1. 560 (18) Å). The nature of the BB double bond in 3 was delineated by DFT computations.
Wang et al. (Fri,) studied this question.
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