In organolithium chemistry evidence is accumulating that lithium atoms situated in abnormally low coordination environments then proceed to interact with nearby CH units of the ligands. For example, the crystal structure of [(PhCH,),NLi], revealed a planar (NLi)3 ring whose formally just two-coordinate metal atoms form close contacts with CHpCoCH portions of the benzyl groups.
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Andrews et al. (1988) studied this question.