Jf. Allan et al., Synthesis and structural characterisation of a magnesium bisenolate: a tetrameric (Mg2O2)(2) chain terminated by solvating ketone, CHEM COMMUN, (12), 2000, pp. 1059-1060
A reactive magnesium enolate intermediate has been identified containing th
e remarkable composition of four metals, eight enolates (six bridging and t
wo terminally bound) and two unenolised ketones, and its implications in th
e aldol addition reaction are discussed.