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Catalytic amount of TBAT (0.2mol%) promoted desilylation and subsequent defluorination of ketene silyl acetal of methyl O-trimethylsilyltrifluorolactate, affording methyl β,β-difluoro-α-trimethylsilyloxyacrylate in 95% yield of which reaction with electrophiles provided methyl β-substituted-β,β-difluoropyruvate in good yields.
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