Absolute configurations of flavan-3-ols and 4-arylflavan-3-olsvia a modified mosher's method

Abstract 1 H NMR Analysis of R-(+)-α-methoxy-α-trifluoromethylphenyl acetic acid (MTPA) esters of different sets of enantiomeric flavan-3-ols and 4-arylflavan-3-ols respectively, permits assessment of the absolute configurations at C-3 of these condensed tannin structural units.