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Cycloaddition of N-aryl-1,2,4-triazole-3,5-dione to N-substituted perylene bisimide [187,188,189]. Reagents and conditions: (a) for the cycloaddition of 138 to 126: p-chloranil, benzene, 75 °C, N2, 7 d; Y = 85% of 141 (the monoadduct was not isolated) and (b) for the cycloaddition of 88 to 128: p-chloranil, dry toluene, rfx, N2; Y = up to 41% of 139 (for 140, yield was not reported).
