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Abstract 2,2-Difluoroketene silyl acetal, generated in situ by treating methyl difluoroiodoacetate with Zn followed by chlorosilane, readily reacted with α,β-unsaturated carbonyl compounds or acetals to give the 1,4-addition products, preferentially. The difluoro analogs of glutamic acid and lysine were prepared through the present reaction.
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Kitagawa et al. (1990) studied this question.
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