17 Baltina, L.A. Shabieva, E.R. Kondratenko, R.M. Spirikhin, L.V. Baltina, L.A. 2017 2018-01-31 10.1007/s10600-017-2148-3 The reaction of paeoniflorin (PF) with refluxing MeOH in the presence of cation exchanger KU-2-8 (H+) formed a mixture of the 4-O-methyl- and 4-oxo-9-O-methyl ethers (1:1, overall yield 90%) that were separated by chromatography over silica gel. The reaction of PF with EtOH and BuOH under analogous conditions also formed mixtures of the ethyl and butyl ethers from which 4-oxo-9-O-ethyl(butyl) ethers were isolated as the tetra-O-acetates. The structures of the obtained compounds were confirmed using PMR and 13C NMR spectra. https://repo.bashgmu.ru/publication/1128 https://repo.bashgmu.ru/files/1287