Angewandte Chemie International Edition

Cover image for Vol. 54 Issue 10

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 (Angew. Chem. Int. Ed. Engl. 7/1986)

25_07/1986The cover picture shows pieces of a puzzle of substructures of novel, cyclic conjugated [4n]-π-electron systems. The fragments are shown in the colors of the solutions of the respective “antiaromatics”. Pleiaheptalene (yellow) is the first peri-annelated [4n]-π-electron system without aromatic partial structures. 9b-Methyl-9bH-benz[cd]azulene (blue), a tricyclic [12]annulene, has an almost planar perimeter and shows pronounced paratropism. In contrast, 1,2,5,7-tetra-tert-butyl-s-indacene (red fluorescence), a planar annelated 12π-electron system, exhibits only a slight paratropic ring-current effect with extensive delocalization. More about these novel compounds is reported by K. Hafner et al. on page 630.

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