Figure 2. Substitution effect on the outcome of the deoxyfluorination.

(a) A proposed competitive reaction pathway that arises from an equilibrium between alkoxycyclopropenium cation I and cyclopropenone acetal II. (b) Optimization on the deoxyfluorination via screening CpFluors with different aryl substitutents. Yields of 3a were determined by ¹⁹F NMR spectroscopy using PhCF₃ as an internal standard. Yields of 4 refer to the isolated yields.