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Synthesis of 1,2-diazobenzo[ghi]perylene via the cycloaddition of dialkyl diazene dicarboxylates to the perylene bay region [145]. Reagents and conditions: (a) for 200: benzene, rfx, 5 h, Y = 87% and (b) for 201: no solvent, 160 °C, 2 h, Y = 73%.
