This chapter summarizes the accomplishments made in the past 40 years involving organometallic Ni(III) and Ni(IV) complexes, with a focus on the more recent systems that exhibit rich reactivity profiles. In addition, high‐valent non‐organometallic Ni complexes proposed to play a role in various organic transformations are also discussed. Mirica, L. M.; Smith, S. M.; Griego, … Read more