Angewandte Chemie International Edition

Cover image for Vol. 55 Issue 41

Editor: Peter Gölitz, Deputy Editors: Neville Compton, Haymo Ross

Online ISSN: 1521-3773

Associated Title(s): Angewandte Chemie, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemistryOpen, ChemPlusChem, Zeitschrift für Chemie

Cover Picture: Breaking Down Barriers: The Liaison Between Sigmatropic Shifts, Electrocyclic Reactions, and Three-Center Cations (Angew. Chem. Int. Ed. 47/2003)

42_47/2003Orbital-symmetry control was initially explored almost 40 years ago. However, new principles can still be discovered: There is a striking congruence in the geometries of the transition states (not reactants and products) of electrocyclic reactions and sigmatropic shifts related by a proton. A link between these reactions and three-center hydride transfers in a cation is forged, and the idea of a transition-state proton affinity is reintroduced by R. Hoffmann and D. J. Tantillo in their Communication on page 5877 ff.

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