Reactivity III is a new course that presents chemical reactions from the domains of organic, inorganic, and biochemistry that are not readily categorized by electrophile-nucleophile interactions. Many of these reactions involve the transfer of a single electron, in either an intermolecular fashion in the case of oxidation/reduction reactions or an intramolecular fashion in the case of photochemical events. Others, such as pericyclic reactions, involve movement of electron pairs but lack obvious acid/ base analogies and build on an understanding of photochemistry.