A new heterocyclic framework, the dianionic 9,11-diboratacarbazole, has been prepared from a bis(trimethylphosphine)-stabilized 2,2‘-diborabiphenyl derivative, 1, and H 2 NR (R = Ph, CH 2 C 6 H 4 - p -OMe). The heterocyclic framework is formally assembled via Lewis acid chelation of the [NR] 2 - dianion by 2,2‘-diborabiphenyl. These dianions are isoelectronic with the well-studied fluorenyl monoanion.
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Ghesner et al. (2004) studied this question.
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