New connections for old borane cages: Oxidation of suitable precursors in which two decaborate cages are linked in an apical–equatorial fashion provides the borane ions 1 and 2. The two nonequivalent cage fragments are cis-linked, in contrast to the trans-[B20H18]2− ion that has been known for over 30 years. Reductive substitution of 1 and 2 leads to new apical–apical linked anions and disubstituted [B20H18] anions. •=B, ○=BH.
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Li et al. (1998) studied this question.
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