N.m.r. and fluorescence spectra of the products of the reaction of catechin with ethyl bromoacetate show that the 3′- and 4′-phenolic hydroxy-groups become etherified before those at positions 5 and 7.
K. D. Sears and R. J. Engen, J. Chem. Soc. D, 1971, 612 DOI: 10.1039/C29710000612
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