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C70Br10 is the most stable and, apparently, the only product of the C70 bromination in pure bromine and in solution in o-dichlorobenzene. In accordance with the quantum chemical calculations, the ten bromine atoms (orange) form a belt in the equatorial region of the C70 molecule, with nine adjacent pairs of Br atoms located at the 1,4-positions and one pair at the 1,2-position.
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Troyanov et al. (2003) studied this question.
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