Synthesis of Aryl Fluorides on a Solid Support and in Solution by Utilizing a Fluorinated Solvent

F for fast: The perfluorinated solvent C6F14 is the key to a new variant of the Balz–Schiemann reaction for the synthesis of fluorinated arenes. Triazenes are converted into fluoroarenes under mild conditions on a support and in solution (see scheme). The method is straightforward and inexpensive, and yields previously difficult-to-prepare fluoroarenes in high purity.