Crosspeak volumes

Using the 2D-HSQC peak volumes from backbone e-e, e-u, u-e, and u-u -CH2-OR correlations in Figure 39(a) and from chain-end e- and U-CH2-OH correlations in Figure 39(b), they derived an internal -CH2-OR/terminal -CH-OH peak volume ratio of 203 1. Similarly, the direct integration of crosspeak volumes in the spectmm shown in Figure 39(a) gave the monomer distribution ratio of 4.76 3.76 1.00 for butanediol adipate diphenylmethane units. 

The NOESY experiment has also been very useful for revealing the presence of rotational conformers of dimeric flavonoids and flavone C-glycosides (Figure 2.3). Strong exchange crosspeaks between equivalent protons of each conformer revealed the rotational equilibriums. This NOE phenomenon was first noted by Hatano et al. in two conformers of procyanidin dimers. The volume of the NOESY crosspeaks is related to the distance... 

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