Reactions of Bromine Fluoride Dioxide, BrO<sub>2</sub>F, for the Generation of the Mixed‐Valent Bromine Oxygen Cations Br<sub>3</sub>O<sub>4</sub><sup>+</sup> and Br<sub>3</sub>O<sub>6</sub><sup>+</sup>
Angewandte Chemie