The combination of SiCalkynyl bond cleavage and exhaustive CC hydroboration in a “hydride bath” is a new variant in the chemistry of organosilanes and -boranes. Diyne 1, for example, reacts to give two isomeric 1-carba-arachno-pentaboranes(10); 2 is the endo isomer.
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Wrackmeyer et al. (1994) studied this question.
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