The eight-membered ring structure of an α-lithio-2,6-dimethylpyridine–tetramethylenediamine (TMEDA) dimer

Abstract
Unlike monomeric benzyl-lithium, the α-lithiated 2,6-dimethylpyridine–tetramethylethylenediamine complex prefers a dimeric, chair-like, eight-membered ring arrangement involving two intermoleculary chelated lithium atoms and near ideal perpendicular conformations of the α-CH2Li+ groups, as shown by a crystal structure.

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