Chiral induction in (S )-oP 7 ( t Bu), (R)-oP 7 ( i Pr), (R)-oP 7 (Ph), and (S )-oP 7 (Bo) was further studied by CD spectroscopy in chloroform at 298 K. As shown in Figure , each compound gives only a weak CD spectrum. For (S )-oP 7 ( t Bu), (R)-oP 7 ( i Pr), and (S )-oP 7 (Bo), the primary chromophore is the o-phenylene backbone itself. Indeed, the CD spectra of (S )-oP 7 ( t Bu) and (R)-oP 7 ( i Pr) are very similar, with characteristic Cotton effects at 250 and 280 nm. (S )-oP 7 (Bo) shows a somewhat more intense band at long wavelength but is also otherwise quite similar. The CD peak intensities do not scale particularly well with the de's measured by 1 H NMR experiment, suggesting that the de's of (R)-oP 7 ( i Pr) and (S )-oP 7 ( t Bu) may be closer than suggested by the NMR measurements (note also that the two experiments were carried out a different temperatures and are not strictly comparable).