A staggered conformation with D5d symmetry is adopted by the lithocene anion, the simplest metal-locene of the main group metals with a sandwich structure (see picture). [Cp2Li]− forms on treatment of [CpLi] with Ph4PCl in a 2:1 molar ratio in THF and is isolated as the Ph4P+ salt.
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Harder et al. (1994) studied this question.
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