Abbreviations KHMDS Formula KSi2C6NH18 | Molar mass 199.4831 g/mol Appearance White, opaque crystals | |
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Potassium bis(trimethylsilyl)amide (commonly abbreviated as KHMDS, Potassium(K) HexaMethylDiSilazide) is the chemical compound with the formula ((CH3)3Si)2NK. It is a strong, non-nucleophilic base with an approximate pKa of 26 (compare to lithium diisopropylamide, at 36).
Structure
In the solid state, the unsolvated compound is dimeric, with two potassium and two nitrogen atoms forming a square. This compound is soluble in hydrocarbon solvents and conducts electricity poorly in solution and in the melt. This is attributed to very strong ion pairing.
References
Potassium bis(trimethylsilyl)amide Wikipedia(Text) CC BY-SA