1, 2, 3, 4, 5, 6, 7, &octamethylanthracene. Signals in the'H NMR spectrum of 1 have been assigned by isotopic labeling and 2D NMR exchange spectroscopy. The relative steric energies of 20 selected conformations of 1 have been estimated by empirical force field calculations. The same calculations indicate that the spatial separation of the two sets of four dichloromethyl groups on the terminal rings of the anthracene skeleton renders the sets ...
