Navigating Nitration Chemistry: A Practical Guide to Reagents, Mechanisms, and Selectivity

We highlight recent advances in nitration chemistry with emphasis on the development of sustainable and selective methodologies. A comprehensive overview of nitrating reagents is provided, classified by origin (organic or inorganic) and activation mode (photochemical, electrochemical, thermal, and others). Each reagent is critically analyzed with respect to its performance across different nitration processes, that is, aromatic, ipso-, olefinic, alkyne, and heteroatom nitration. This analysis scrutinizes yield, substrate scope, functional group tolerance, versatility, resource and hazard, key features that comprise an efficiency score. A comparative analysis of activation strategies underscores the evolution of nitration from classical mixed-acid approaches to modern photocatalytic, electrochemical, and cross-coupling methodologies. The insights gathered here provide a practical framework for identifying the most suitable nitrating reagents and highlight future directions toward safer, greener, and more versatile nitration chemistry.