Professor Stahl and his research group of graduate and undergraduate students are working on developing effective, environmentally friendly catalysts. In particular, these catalysts would be used for the selective oxidation of organic molecules by molecular oxygen. The desired catalytic cycle includes two stages: oxidation of the substrate by an oxidized transition metal catalyst and regeneration of the oxidized catalyst by dioxygen. Currently, the pharmaceutical and chemical industries are using transition metal oxidants that can be hazardous to the environment. In addition to creating environmentally benign catalysts, the mechanisms of dioxygen coupled catalysis are being investigated. Understanding mechanisms in chemical reactions helps to inspire ideas for and design of more efficient reactions.