Transmetalation of 1,4-dilithio-1,3-butadienes with Ba[N(SiMe3)2]2 gave barium dibenzopentalenides, which were structurally characterized by single-crystal X-ray analysis. A preliminary study of the reaction chemistry of thus obtained barium dibenzopentalenides demonstrated that synthetically useful applications can be expected.
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Li et al. (2013) studied this question.
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