The 'cyclophene' [2.2.2](1,2,4)cyclophan-9-ene.
In the title compound, C18H16, the [2.2]paracyclophane geometry is restrained to a considerable extent despite the introduction of the extra C=C bridge; typical paracyclophane features, such as the elongated C-C bridges, are still observed. However, the bridgehead atoms of the C=C bridge are forced into unusually close proximity [2.657 (3) A], which in turn causes the rings to be rotated to an interplanar angle of 13.7 (2) degrees. The packing involves hexagonally close-packed layers of molecules parallel to the xy plane, corresponding to the known '7,11' pattern of paracyclophanes, but without significant short intermolecular contacts.
Institut für Organische Chemie, Technische Universität Braunschweig, Postfach 3329, 38023 Braunschweig, Germany.
Klaus
K
Broschinski
Arunachalam
A
Kannan
Peter G
PG
Jones
Ina
I
Dix
Henning
H
Hopf