Lithium hexamethyldisilazane
4039-32-1C[Si](C)(C)[N-][Si](C)(C)C.[Li+]YNESATAKKCNGOF-UHFFFAOYSA-NSee also: Hexamethyldisilazane (annotation moved to); Lithium bis(trimethylsilyl)amide (annotation moved to).
4039-32-1Sicherheitsangaben dienen nur zur Orientierung und ersetzen weder das Sicherheitsdatenblatt (SDB) des Lieferanten noch geltende Vorschriften oder eine fachliche Bewertung.
VerwendenLithium bis(trimethylsilyl)amide is used as nonnucleophilic base to generate kinetic ketone and ester enolates. It is considerably more selective than LDA and undesired reductions (e.g., of nonenolizable ketones observed in the case of LDA) can be avoided by using LHMDS.
synthetischeIt is conveniently prepared by the reaction of hexamethyldisilazane with n-butyllithium in hexane. For most uses the hexane is then evaporated and replaced with THF.
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