Apart from the improved substrate scope, our system offers practical advantages for Figure . CEC between 5f and a series of benzylic chlorides, alkyl iodides, and alkyl bromides. Values are reported as the conversion to product relative to all known species derived from 5f determined by UV-Visible spectroscopy (see SI for details). NMR yields were determined by integration of 1 H NMR spectra against a standard (hexamethylbenzene).