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Cycloaddition of acetylene dicarboxylates to the perylene bay region [143,149,152,153]. Reagents and conditions: (a) for R = Me: p-chloranil, PhNO2, 200 °C, 1 h, Y = 22%; (b) for R = Et: toluene, 150 °C, 3 d, Y = 25%; and (c) p-cymene, 185 °C, pressure vessel, 24 h, Y = 95% (33); Y = 96% (34).
