The color of chalcones and flavanones is known to change based on the tautomeric equilibrium. Substituents can impact the color by shifting the equilibrium in favor of one tautomer over the other. For example, electron-withdrawing groups tend to result in a yellow color, while electron-donating groups can lead to a more colorless or pale appearance.
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2-(4-fluorophenyl)-7-methoxychroman-4-one
