Calculated optimized energy (in kcal/mol) of for all C₂ (C₃–C₂–O₁₇–C₉) and C₃ (C₄–C₃–O₁₆–C₈) dihedral angles. The energy axis was shifted so that the lowest energy conformer was set to zero. The insets show the structures of the four optimized methoxy group conformers (obtained for calculations in CCl₄). The emphasis is on displaying the methoxy group orientations, so hydrogen atoms have been removed and the tail at C₆ is not shown. Oxygen/carbon atoms are dark/light shade, respectively. C₂ and C₃ dihedral angles are also listed in each of the insets.