What looks like a scoop wheel on the right are seven ferrocene units, which are linked by four Me2Si groups to the two nearest neighbors. The cycle, which is formed in a polygemination reaction (that is, the reaction of a transition metal halide with a biscyclopentadienyl dianion to give a polymer), has the rare C7h symmetry (idealized). The compound is stable up to 360°C and can be oxidized in three steps up to a heptacation.
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Grossmann et al. (1997) studied this question.
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