Figure 6.

The yield is the sum of vicinal and geminal difluorination products. The regioselectivity ratio (vic:gem) and yield were determined by ¹⁹F NMR spectroscopy using α,α,α‐trifluorotoluene as internal standard. Isolated yield of the vicinal product is given in parentheses. Enantioselectivity determined by chiral HPLC. ^a After recrystallisation. N.B.: The products are often highly volatile and care must be taken in the isolation.