Fig. 3. 1H NMR spectra (500 MHz, 0 °C) of oP6(M), oP6(Phen)3+3, oP6(BIP)3+3, and oP6(DPB)3+3. 1H assignments for the major conformers of oP6(M) and oP6(DPB)3+3 are shown (blue), as are imine 1H assignments to backbone geometries (orange). Assignments of the imine signals of oP6(Phen)3+3 to the homochiral D3 and heterochiral C2 stereoisomers are also labeled.
