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Thermolysis of N-(diphenylenamino)pyrrolediones proceeds with formation of dihydropyrazolone 1,4-dipoles. [4 + 4] Homodimerizations and a series of [4 + 2] and [4 + 1] cycloadditions of these species with various dipolarophiles were investigated.doi:10.1039/c6ra21981k fatcat:6scndxeq25drdosnujiqv6hc7a