7-Methoxy-4-methylcoumarin undergoes a solid-state photo [2 + 2] cycloaddition upon UV irradiation to yield two photodimers. The formation of the minor product appears to be a direct consequence of the formation of the topochemically controlled dimer.
J. N. Moorthy and K. Venkatesan, J. Mater. Chem., 1992, 2, 675 DOI: 10.1039/JM9920200675
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