A hetero-alkali-metal version of the utility amide LDA: lithium-potassium diisopropylamide

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Designed to extend the synthetically important alkali-metal diisopropylamide [(NPr2)-Pr-i; DA] class of compounds, the first example of a hetero-alkali-metallic complex of DA has been prepared as a partial TMEDA solvate. Revealed by an X-ray crystallographic study, its structure exists as a discrete lithium-rich trinuclear Li2KN3 heterocycle, with TMEDA only solvating the largest of the alkali-metals, with the two-coordinate lithium atoms being close to linearity [161.9(2)degrees]. A variety of NMR spectroscopic studies, including variable temperature and DOSY NMR experiments, suggests that this new form of LDA maintains its integrity in non-polar hydrocarbon solution. This complex thus represents a rare example of a KDA molecule which is soluble in non-polar medium without the need for excessive amounts of solubilizing Lewis donor being added.

Original languageEnglish
Pages (from-to)3704-3711
Number of pages8
JournalDalton Transactions
Issue number10
Early online date20 Dec 2012
Publication statusPublished - 2013


  • alkali-metal diisopropylamide
  • X-ray crystallography
  • lithium atoms


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