Two chloro-subsitituted cinnamic acids have been induced to co-crystallise as a molecular complex which is converted, at different rates, into an unsymmetrical and two symmetrical cyclobutanes during solid-state topochemical 2 + 2 photoaddition.
J. A. R. P. Sarma and G. R. Desiraju, J. Chem. Soc., Chem. Commun., 1984, 145 DOI: 10.1039/C39840000145
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