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Dibenzo[a,o]phenanthro[3,4-s]pycene, a Configurationally Stable Double Helicene:  Synthesis and Determination of Its Conformation by NMR and GIAO Calculations

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journal contribution
posted on 26.04.2003, 00:00 by Diego Peña, Agustín Cobas, Dolores Pérez, Enrique Guitián, Luis Castedo
A double helicene formed by a pentahelicene and a heptahelicene with two rings in common was obtained by palladium-catalyzed cyclotrimerization of 3,4-didehydrophenanthrene and was characterized conformationally by NMR and GIAO calculations.