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The coordination properties of pentamethylpyrrole and arenes are similar; this was shown by comparison of the spectroscopic data and chemical properties of the pentamethylpyrrole complexes 1 and 2 with those of the corresponding arene complexes. Complexes 1 and 2 are accessible by reaction of the sulfane complexes [CpM(SMe2)3][BF4]n (MFe, n1; MCo, n2) with pentamethylpyrrole.
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Kühn et al. (1988) studied this question.
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