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Lucky thirteen: The first example of a manganese(II) allyl complex, [Li(thf)4][Mn{η3-(Me3Si)2C3H3}{η1-(Me3Si)2C3H3}2], contains a tris(allyl)manganate monoanion (depicted). The structure of the anion was determined and shown to contain both π- and σ-allyl ligands, resulting in an unusually low valence-electron count of thirteen.
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Layfield et al. (2004) studied this question.
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