Angewandte Chemie International Edition
Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Cover Picture (Angew. Chem. Int. Ed. Engl. 2/1987)
The cover sows an extremely unusual cyclohexane derivative. In this [6.5]coronane, each pair of neighboring C atoms of the six-membered ring are joined by a -(CH2)3- bridge, resulting in the formation of six-additional rings. The 13C-NMR spectrum of the compound is only in agreement with a rapidly inverting species having an all-cis conformation. Low-temperature spectra, as well as force field calculations, on an analogue containing only five additional rings, indicate that the central ring exists in a flattened chairconformation. Further details are reported by L. Fitjer et. al. on p. 130 ff.