Aminocyclopropenium Ions: Synthesis, Properties, and Applications

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

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