Abstract
Abstract The title polycyclic aromatic hydrocarbons were synthesized by Pd-catalyzed Heck-type cyclotrimerization of 2-bromoaceanthrylene derivatives. X-ray analysis of the 2,4,6-trimethylphenyl substituted derivative revealed that molecules took a propeller-shaped aromatic framework. The barrier to propeller inversion of this derivative was determined to be 81 kJ mol−1 by a dynamic NMR method.
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