Aminocyclopropenium Ions: Synthesis, Properties, and Applications

This review covers the preparation, physical properties, and applications of cyclopropenium ions bearing one, two, or three amino substituents. It provides a description of the most reliable methods to access these unique structures as well as a discussion of the reactivity profiles of the common subtypes. 1Introduction 2Preparation 3Properties 3.1Stability 3.2Redox Behavior 3.3Ion Pair Strain 4Reactions 5Applications 5.1Ionic Liquids 5.2Metal Complexes 5.2.1TDAC -Complexes 5.2.2BDAC sigma-Complexes 5.2.3Cyclopropenimine Ligands 5.2.4BDAC-Phosphorus Ligands 5.3BrOnsted Bases 6Conclusion