As the first example of the [4 + 4] cis-syn dimer of 2-pyridone, the meso-cis-syn dimer of 5-chloro-2-pyridone was prepared by photoirradiation of a 1:4 inclusion complex of a 1,2,4,5-benzenetetracarboxylic acid host and 5-chloro-2-pyridone in the solid state, and the steric course of the reaction was studied by X-ray analysis.
New [4 + 4] photodimerization of 5-chloro-2-pyridone to the meso-cis-syn dimer as an inclusion complex with 1,2,4,5-benzenetetracarboxylic acid
S. Hirano, S. Toyota and F. Toda, Mendeleev Commun., 2004, 14, 247 DOI: 10.1070/MC2004v014n06ABEH002030
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