Abstract
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.
1 Introduction
2 Preparation
3 Properties
3.1 Stability
3.2 Redox Behavior
3.3 Ion Pair Strain
4 Reactions
5 Applications
5.1 Ionic Liquids
5.2 Metal Complexes
5.2.1 TDAC π-Complexes
5.2.2 BDAC σ-Complexes
5.2.3 Cyclopropenimine Ligands
5.2.4 BDAC–Phosphorus Ligands
5.3 Brønsted Bases
6 Conclusion
Key words
cyclopropenium ions - aromaticity - cyclopropenimines - ionic liquids - ligands