The first structurally characterized sodium lithate 1 was obtained by selective transmetalation of [Li{(2-NC5H4)2CH}(thf)2] (2) with the superbase 2/NaOtBu. The exchange of only half an equivalent of Li ions in 2 is ascribed to the shape and the basicity of the bis(pyridyl)methyl ligand.
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Gornitzka et al. (1994) studied this question.
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