CD spectra are especially useful in the determination of absolute configurations of e.g. HHDP groups of ellagitannins
Utilization of CD measurements in polyphenol and especially tannin analysis has not been as common as it could have been. Therefore we lack published reference CD data for pure tannins. The same gap we had for a long time for tannins’ UV spectra as well. At the moment this gap is being narrowed, since the measurement of CD spectra is relatively straight forward even from dilute solutions that could not be used for NMR analyses.
We soon update examples of CD spectra into this section together with the corresponding tannin structures.