[4,8]-2,3-trans-3,4-trans-(–)-Fisetinidol-2,3-trans-(+)-catechin and its (–)-robinetinidol homologue are to a varying degree subject to facile ring isomerizations (also when preceded by induced positional isomerization) in NaHCO3–Na2CO3 buffer solution under nitrogen, with liberation of reactive nucleophilic resorcinol units to form a range of bifunctional phlobatannins.
J. P. Steynberg, D. A. Young, J. F. W. Burger, D. Ferreira and D. G. Roux, J. Chem. Soc., Chem. Commun., 1986, 1013 DOI: 10.1039/C39860001013
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