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Proton NMR spectra (600-MHz, DMSO-d6) of bis(benzylidene)acetone (22), bis(2-hydroxybenzylidene)acetone (23), and bis(4-hydroxybenzylidene)acetone (24). The amplitudes of the hydroxyl resonances for 23 (3.57 ppm) and for 24 (10.05 ppm) are scaled with respect to the other resonances at 0.67-fold and 15-fold.
