Eight, ten, and twelve functional groups can be introduced by the double-branching of the methyl groups in polymethyl hydrocarbon π ligands. The one-pot reaction of [CpFe(η6-1,2,4,5-Me4C6H2)] with allylbromide provides iron complex 1 (75% yield) which can be converted to the analogous octol or cleaved photochemically to liberate the octaallyl ligand. FE = CpFe+
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Moulines et al. (1992) studied this question.
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