The reinvestigation of the solid-state photoreactivity of ethyl (E)-alfa-cyano-2-methoxycinnamate (1) allowed us to obtain the corresponding dimer which was shown to be diethyl (1alfa,2alfa,3beta,4beta)-1,3-dicyano-2,4-bis(2-methoxyphenyl)cyclobutane-1,3-dicarboxylate (2) whose structure was proven on the basis of chemical reactivity and spectroscopic data.
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Chimichi et al. (1987) studied this question.