Figure 7
From: Total synthesis of the reported structure of 13a-hydroxytylophorine

Variance of 1H NMR of aromatic protons with incremental amounts of TFA added (red lines indicate literature values for 1).
From: Total synthesis of the reported structure of 13a-hydroxytylophorine

Variance of 1H NMR of aromatic protons with incremental amounts of TFA added (red lines indicate literature values for 1).