Angewandte Chemie International Edition

Cover image for Vol. 53 Issue 28

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, Zeitschrift für Chemie

Cover Picture: 5-Dehydro-1,3-quinodimethane: A Hydrocarbon with an Open-Shell Doublet Ground State (Angew. Chem. Int. Ed. 6/2004)

43_06/2004Contrary to the accepted guidelines for the occupancy of orbitals (such as Hund's rule or the Aufbau principle), three unpaired electrons are coupled antiferromagnetically in the 5-dehydro-m-xylylene triradical. This first example of an organic molecule with an “open-shell” doublet ground state is described by P. G. Wenthold, A. I. Krylov, and co-workers on page 742 ff. The cover pictures shows the singly occupied orbitals in the triradical and highlights the correlation between theoretical and experimental results.

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