Fig. 4. Relative energies between two conformers of (a) 2A and 2B, (b) 3A and 3B, (c) 2AH and 2BH, and (d) 3AH and 3BH. The energies of P,S-2, P,S-2H, P,S-3, and P,S-3H (corresponding to 2A, 2AH, 3A, and 3AH) were calculated relative to those of M,S-2, M,S-2H, M,S-3, and M,S-3H (corresponding to 2B, 2BH, 3B, and 3BH), respectively.
