Fluorine-facilitated Claisenrearrangement has been employed as a key step in the synthesis of α-fluoroketones 5. The elimination of sulfenic acid from the allyl ethers 3 are effected under FVP conditions.
Fluoromethylketones 3 are synthesized in good yields by a flash vacuum pyrolyticelimination of 2. Studies on the improved synthesis of 2 leads to the evidence on the existence of α,α-dilithio fluoromethyl phenyl sulfoxide.