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In 1-phenylbutane-1,3-dione (1), which enol tautomer will be predominant?
Both carbonyl groups possess α-hydrogens, so can undergo keto-enol tautomerism. In particular, the carbonyl group on the right can enolise in two ways since there are two unique sets of α-hydrogens.
The answer is supposed to be enol 2. Why can't it be either 3 or 4?
2026-10-27
