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Synthesis of 1,2-diazobenzo[ghi]perylene derivative via the cycloaddition of dialkyl diazene dicarboxylates to the perylene bay region [145]. Reagents and conditions: (a) for R = Et: 160 °C, 1.5 h, Y = 40% and (b) for R = i-Pr: 160 °C, 4.5 h, Y = 32%.
