We reasoned that modifying the surface of the o-phenylene to better interact with the imides could increase the efficiency of chiral induction. This requires substitution of the terminal rings, which are stacked directly above and below the imide when the oligomer is folded. The (S )-oP 7 (CF 3 )(Bo). Trifluoromethyl groups were chosen as they are bulky and also should maintain good folding by increasing the strength of arene-arene stacking interactions between rings 1, 4, and 7. The terminal rings were symmetrically functionalized so that rotation of the terminal rings would yield identical geometries, but it seems very likely that only the positions highlighted in Figure should be able to interact with the chiral groups at a given time. For comparison, we also prepared methyl-substituted (S )-oP 7 (CH 3 )( t Bu).