The 1 H NMR spectrum acquired at 500 MHz with the Royal HFX probe using the ECZR 500 console is presented in figure 2. Because of the nature of the structure there is at first glance very little fine structure to facilitate clear assignments. Almost all resonances including what appear to be singlets are significantly sharpened by the application of 19 F decoupling. However, the top pane of figure 2 detailing the phenyl region which contains two 19 F resonances cannot be visually assigned without 19 F decoupling. Decoupling 19 F removes confusion with the three resonances for Phe-6, PHe-3, and Phe-5 being revealed with classically simple ortho, ortho-meta, and meta coupling patterns respectively… cannot be visually assigned without 19 F decoupling.