Nevertheless, solvent-free crystal structures are also known, especially in case of highly substituted magnesocenes (Morley et al., 1987 ▸ Gardiner et al., 1991 ▸ Weber et al., 2002 ▸ Vollet et al., 2003 ▸ Deacon et al., 2015 ▸ Müller et al., 2021 ▸). Therefore, many crystal structures of magnesocenes are actually of donor complexes, such as magnesocene mono- and bis(tetrahydrofuran) adduct, Cp 2Mg One of the key differences in reactivity between alkaline-earth metallocenes and ferrocenes is that the central atoms of the former exhibit Lewis acidic character. Although magnesocene exhibits distinctively different chemical properties, it is isostructural to ferrocene and marked the beginning of main-group metallocene chemistry. Magnesocene (Cp 2Mg) was initially reported by Wilkinson and Fischer and co-workers in 1954, just a few years after the discovery of ferrocene (Wilkinson & Cotton, 1954 ▸ Fischer & Hafner, 1954 ▸).
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