Fluorination/Dearomatization of CF Groups: An FLP Route to an Electrophilic Borane and Non-Coordinating Anions.

B(CF) and the corresponding anion [B(CF)] are ubiquitous in main group and transition metal chemistry. Known derivatives are generally limited to the incorporation of electron donating substituents. Herein we describe electrophilic fluorination and dearomatization of such species using XeF in the presence of BF or Lewis acidic cations.