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Trimethylsilyl trifluoromethanesulfonate is a strong base useful for aziridine formation, alkylation, nitration, etc.

Trimethylsilyl trifluoromethanesulfonate is prepared via reaction of t-Butylamine with the highly hygroscopic Vilsmeier salt obtained  by reaction of N,N,N′,N′-tetramethylurea and Phosgene.