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The preparation and characterization of five new imidazabole derivatives is reported: 1,5-dibenzyl-4,4,8,8-tetrahydroimidazabole (2), 4,4,8,8-tetrafluoro-1,5-dimethylimidazabole (3), 4,4-difluoro-8,8-dihydro-1,5-dimethylimidazabole (4), 4,4,8,8-tetrachloro-1,5-dimethylimidazabole (5), and 4,4,8,8-tetraethyl-1,5-dimethylimidazabole (6). The structures of compounds 2–6 as dimeric carbene–borane adducts rather than dimeric N-borane adducts are discussed on the basis of NMR (2–6) and X-ray diffraction data (2, 3, 5 and 6).
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Padilla‐Martínez et al. (1998) studied this question.
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