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Lay low for a while: The low‐lying nπ* and ππ* triplet states of substituted acetophenones have been directly observed by time‐resolved near‐infrared spectroscopy. The apparent reactivities of the ππ* T1 states of acetophenones have been shown to arise from the thermal population of the higher nπ* T2 states. Thermal equilibrium also occurs between the T1 and T2 states of the acetophenones.
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