The oxidation of molecules is a cornerstone functional group transformation in organic synthesis and one of the most important chemical processes in the chemicals industry.1 However, many of the methods that chemists rely on today to mediate this functional group transformation still frequently rely on stoichiometric amounts of toxic oxidants, heavy metals, or energy-intensive reaction conditions, raising concerns regarding sustainability and environmental impact. In this presentation, we will disclose our contributions toward developing more sustainable and greener oxidation methods based on the controlled formation of a highly reactive N-centred radical species under mild reaction conditions. For example, we will highlight recent studies that developed a site-selective synthetic method to prepare N-formyl amines efficiently from copper(I)-catalyzed oxidation of α-silylamines by air at room temperature.2