Hypervalent Iodine-Mediated Fluorination of Styrene Derivatives: Stoichiometric and Catalytic Transformation to 2,2-Difluoroethylarenes

Fluorination of styrene derivatives with a reagent system composed of μ-oxo-bis­[trifluoroacetato­(phenyl)­iodine] and a pyridine·HF complex gave the corresponding (2,2-difluoroethyl)­arenes in good yields. Similarly, the reagent of PhI­(OCOCF₃)₂ and the pyridine·HF complex acted as a fluorinating agent for styrene derivatives. The fluorination of styrene derivatives with the pyridine·HF complex underwent under catalytic conditions using 4-iodotoluene as a catalyst and m-CPBA as a terminal oxidant.