Since the discovery of Sc₃N@C₈₀ in 1999, much literature has focused on isolating metallic nitride clusters (M₃N) entrapped within the smaller C₈₀ cage.  Over time, scientists (e.g., Echegoyen) have explored the same M₃N clusters, but with bigger cage sizes, to expand the family of M₃N@C_2n.  While HPLC has been the dominant method to isolate the larger M₃N@C_88-112, our research group is investigating non-chromatographic methods to purify M₃N@C_88-112 with the goal of disseminating these larger species to the scientific community.  In this presentation, we demonstrate selective reactions of metallic nitride endohedrals present in soot extracts.  Successful reagents include electron-poor Lewis acids and electron-rich amines.  Combining these two reaction classes now permits the chemical purification of mixed-metal CeLu₂N@C₈₀ as an example of a C₈₀ cage.  Our most recent example of chemically isolating a metallic nitride in a larger cage is Gd₃N@C₈₈.  Currently, we are spreading this purification method to transition metal and other rare-earth M₃N clusterfullerenes.