The first dimeric lithium alkylideneamide with a μ2-nitrogen ligand and resulting Li2N2 ring is the solvent-stabilized title compound 1. The ring is exactly planar. Both the dimer 1 and the monomer are present in aromatic solvents, as was confirmed by cryoscopic Mr determinations in combination with high-field 1H- and 7Li-NMR measurements.
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Barr et al. (1985) studied this question.
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