For all compounds, the relative populations of the two diastereomeric twist senses could be obtained by deconvolution of the 1 H NMR spectra. Signals that were judged to give the best separation were chosen in each case, with ±10% errors assumed on each integral. The resulting diastereomeric excesses (de's) are shown in Table . In general, chiral induction in this series is quite low with de's essentially indistinguishable within experimental error, although that of (R)-oP 7 ( i Pr) may be slightly higher than the others.