Reactions of chelating alkali metal amides with the Grignard reagent nBuMgCl: crystal structures and solution 1H NMR spectroscopic studies of the expected mono(amido)-product [PhCH2(Me2NCH2CH2)NMgnBu]2 and the unexpected bis(amido)-product {[Ph(2-Pyr)N]2M9 · (THF)2}

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