Figure 7.

Sector rules for ¹L_a and ¹L_b ECD bands of monosubstituted benzene. The nodal planes (green: ring plane; light blue or cyan: perpendicular to ring plane) divide the space into sectors. A substituent, or a piece of a substituent, is viewed as a perturber placed in each sector and is represented by a sphere. Its contribution to the ECD band has the sign drawn on the spheres (blue, positive; red, negative). In the presence of further substituents on the ring (e.g., methyl groups attached at 2′ and 6′), the vertical nodal planes may be rotated around the vertical axis by an angle proportional to the substituent spectroscopic moment.