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1,1′-Dimesityluranocene gives a 1 H NMR spectrum showing the mesityl groups in a locked position as expected with exo- and endo-ortho-methyl groups. The [8]annulene ring protons give four resonances at room temperature in a 2:2:2:1 ratio, but at low temperatures three of these resonances coalesce and reappear as six resonances at still lower temperatures. These results are interpreted in terms...
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