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The compounds 1,1′,2,2′- and 1,1′,3,3′-tetra-t-butylferrocene (1,2-BUT and 1,3-BUT, respectively) were oxidized with AgReO4 in dichloromethane and the ferrocenium(1+) salts were isolated, after recrystallization from acetone, as dark-blue or dark-green crystals of [1,2-BUT+][ReO4−] and [1,3-BUT+][ReO4−]·acetone, respectively, which were suitable for X-ray diffraction. As expected from the known structures...
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