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Updated: Jul 13, 2026

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
Published on: September 18, 2016
C-H...pi interactions in five ethynyl-substituted [2.2]paracyclophanes: further examples of the '7,11' packing
Peter G Jones1, Ina Dix, Henning Hopf
1Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Postfach 3329, 38023 Braunschweig, Germany. p.jones@tu-bs.de
Abstract:
The monosubstituted derivative 4-ethynyl[2.2]paracyclophane, C(18)H(16), (I), and the four disubstituted isomers, 4,12-, (II), 4,13-, (III), 4,15-, (IV), and 4,16-diethynyl[2.2]paracyclophane, (V), all C(20)H(16), show the usual distortions of the [2.2]paracyclophane framework. The crystal packing is analyzed in terms of C-H...pi interactions, some with H...pi as short as 2.47 A, in which the cyclophane rings and/or the triple-bond systems may act as acceptors. For compounds (I) and (IV), the known '7,11'-type cyclophane packing is observed, with a herring-bone pattern of molecules in a layer structure.
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