Dipyridones photodimerization

Intramolecular photodimerization of 2-pyridones provides a series of primary photoproducts, the structures of which were a function of the chain length comecting the two reactive centers." The initially formed dimers were characterized as being derived from a photochemically allowed [2 + 2] cycloaddition process in each case examined. A particularly interesting example from this study in terms of [4 + 4] cycloaddition chemistry is the conversion of dipyridone (114) into Ae net [4 + 4] dimer (115) via a facile thermal rearrangement. " Further irradiation of the [4 + 4] species (115) produced a second [2 + 2] adduct that was isomeric with the initially formed metastable species. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ , ]

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