The understanding of the mechanism of organoboration in 1 rests on the stabilization of the diorganotin dication by two CC triple bonds. Compound 1 where R = Me was isolated from tetra-1-propynylstannane and triethyl borane. X-ray analysis shows that the halves of the molecule are not exactly symmetric, but have different bond lengths and angles.
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Wrackmeyer et al. (1991) studied this question.
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