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.
Broschinski
Klaus
K
Institut für Organische Chemie, Technische Universität Braunschweig, Postfach 3329, 38023 Braunschweig, Germany.
Kannan
Arunachalam
A
Jones
Peter G
PG
Dix
Ina
I
Hopf
Henning
H