Lithium-rich main group element clusters characterize the title compounds 1 and 2 (right: structure of 1 without silyl substituents; back = P,O, white = Li), which are obtained by lithiation of the appropriate primary silylphosphane and silylarsane, respectively, with two equivalents of nBuLi in the presence of Li2O. The frameworks of 1 and 2 are topologically best described as two interpenetrating shells of silylated P or As dianions and Li cations, with a formal charge of −4, which encapsulate a [Li6O]4+ octahedron.
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Drieß et al. (1996) studied this question.
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