Compound 3l
(R)-2,3-difluoro-6-(1-fluoroethyl)benzaldehyde
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Synthetic procedure: See article for the definitive version of this procedure and for full experimental details.
1l was fluorinated following general procedure B described for compound 3k (52% NMR yield of 3l). Due to volatility, 3l was directly converted into 5l for characterization.