Figure 3
From: Kinetic investigations of sulfite addition to flavanols
Top: acid-induced C(2) epimerisation of (−) epicatechin (1) leading to ent-2 and/or, in presence of hydrogen sulfite, epicatechin ring-C opened sulfonates (12); Bottom: acid-induced C(2) epimerisation of (\(+\)) catechin (2) leading to ent-1 and/or, in presence of hydrogen sulfite, catechin ring-C opened sulfonates (14).
