Front Cover Picture: Bicyclic Aziridinium Ions in Azaheterocyclic Chemistry - Preparation and Synthetic Application of 1-Azoniabicyclo[n.1.0]alkanes (Adv. Synth. Catal. 22/2016)

The front cover picture illustrates the use of 1‐azoniabicyclo[n.1.0]alkane scaffolds (bicyclic aziridinium ions), which have emerged as versatile synthetic intermediates for the construction of a broad variety of nitrogen‐containing heterocycles. The corresponding review article provides a comprehensive survey of all pathways leading to the generation of 1‐azoniabicyclo[n.1.0]alkanes, as well as a discussion on their subsequent ring expansions to relevant azaheterocycles, governed by ring size, substitution pattern, and/or the nature of the applied nucleophiles. Details can be found in the review on pages 3485–3511 (J. Dolfen, N. N. Yadav, N. De Kimpe, M. D'hooghe, H.‐J. Ha, Adv. Synth. Catal. 2016, 358, 3485–3511; DOI: 10.1002/adsc.201600750).