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The carbanion of diethyl 1-cyano-1-fluoromethanephosphonate 3, generated in situ from diethyl cyanomethanephosphonate 2 and N-fluorobis(trifluoromethanesulfonyl)imide 1, undergoes the Wittig–Horner reaction with aldehydes and ketones to yield α-fluoro-α,β-unsaturated nitriles 5.
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Xu et al. (1992) studied this question.
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