The Front Cover shows the schematic preparation of a strained bicyclic ammonium cation (top). At first sight, unusual NMR spectroscopic characteristics were puzzling and DFT calculations were performed to support the proposed structure (bottom: detail of 13C NMR and COSY spectra). In the center, the πC=C and σ*C–N natural bonding orbitals are highlighted because a significant hyperconjugation was predicted by the computational methods. In the background, a UV image of the Cygnus Loop nebula is shown (image credit with permission: NASA/JPL‐Caltech, PIA15415) as the photocyclization used for the synthesis employs the same type of radiation. More information can be found in the Communication by T. Opatz et al.
European Journal of Organic Chemistry – Wiley
Published: Jan 14, 2018
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