The first complexes containing an alkynide ligand which bridges two different main group elements in an η2 (σ,π) bond have been detected by multinuclear NMR spectroscopy and X-ray structure analyses. The compounds 2, in which the triorganolead cation is stabilized by side-on coordination to the CC bond, are formed via cleavage of the lead-alkynyl bond in the organoboration of dialkynylplumbanes 1 [Eq.(1)].
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Wrackmeyer et al. (1989) studied this question.
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