Trimethylsilylacetic acid dianion: application to organic synthesis

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Abstract
Trimethylsilylacetic acid readily forms the dianion (2) providing highly efficient routes to α-trimethylsilylcarboxylic acids, α,β-unsaturated acids, and α-trimethylsilyl-γ-butyrolactones; the latter can then be converted into α-ylidene-γ-butyrolactones, α-bromo-γ-butyrolactones and γ-butyrolactones.