Orange acenaphthylene-1,2-dicarboxylic anhydride undergoes a solid state photochemical [2 + 2] cycloaddition upon irradiation at 390 nm to yield a white photodimer which can be cleaved back to two monomers by irradiation at 300 nm; this process can be repeated numerous times.
R. D. Rieke, G. O. Page, P. M. Hudnall, R. W. Arhart and T. W. Bouldin, J. Chem. Soc., Chem. Commun., 1990, 38 DOI: 10.1039/C39900000038
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