[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[N:9]=[C:10]([C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][N:22]=3)N=N[C:13]=2[C:14]2[CH:19]=[CH:18][C:17]([Br:20])=[CH:16][CH:15]=2)=[CH:4][CH:3]=1.[CH:27]12CC(C=C1)C=[CH:28]2.C1(C)C(C)=CC=CC=1.O>C1(C)C=CC=CC=1>[Br:20][C:17]1[CH:18]=[CH:19][C:14]([C:13]2[CH:27]=[CH:28][C:10]([C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][N:22]=3)=[N:9][C:8]=2[C:5]2[CH:6]=[CH:7][C:2]([Br:1])=[CH:3][CH:4]=2)=[CH:15][CH:16]=1In a 500 mL three-neck flask were put 13 g (27 mmol) of 5,6-bis(4-bromophenyl)-3-(2-pyridyl)-1,2,4-triazine, 9.0 mL (83 mmol) of 2,5-Norbornadiene, and 150 mL of xylene. This mixture was refluxed at 140° C. for 5 hours under a nitrogen stream. After a certain time, water was added to the mixture, and an aqueous layer was extracted with toluene. The extract was washed with a saturated saline together with the organic layer, and the organic layer was then dried with magnesium sulfate. The mixture was subjected to gravity filtration, and the obtained filtrate was concentrated to give a solid. The solid was refined with silica gel column chromatography (toluene), so that a target substance, 7.5 g of light-yellow powder was obtained in a yield of 59%.
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