Shape-shifter: The beryllium allyl complex [Be{1,3-(SiMe3)2C3H3}2(Et2O)] (see picture) has been synthesized and its X-ray structure determined. Although the allyl ligands are σ bonded, the molecule is fluxional in solution, and it engages in a Schlenk equilibrium with BeCl2. DFT calculations suggest that in the absence of a coordinated base, both σ- and π-bound forms would be potential energy minima.
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Chmely et al. (2010) studied this question.
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