Crystalline nBuLi is also hexameric; this same degree of oligomerization was determined years ago in solutions of hydrocarbons. Six Li atoms form a distorted octahedron, six of whose triangular faces are capped by nBu groups (see structure depicted). The unusual arrangement of the β-C atoms indicates interactions with the Li atoms. In contrast, tBuLi forms a Td-symmetric tetramer in the solid state.
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Kottke et al. (1993) studied this question.
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