Dibenzo[a,o]phenanthro[3,4-s]pycene, a configurationally stable double helicene: synthesis and determination of its conformation by NMR and GIAO calculations.
[reaction: see text] 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.
Peña
Diego
D
Departamento de Química Orgánica y Unidad Asociada al CSIC, Universidad de Santiago, 15782 Santiago de Compostela, Spain.
Cobas
Agustín
A
Pérez
Dolores
D
Guitián
Enrique
E
Castedo
Luis
L