3-Methyl-1:12-benzoperylene, 4-methyl-1:12-benzoperylene and 3,10-dimethyl-1:12-benzoperylene have been synthesized. The protons in the ABX systems of perylene have different coupling constants whilst in 1:12-benzoperylene JXB, JAB, JBA and JBX are equal. This is explained by the formulation with aromatic sextets. The NMR spectra of the Me derivatives support this formulation. The comparison of the