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Cycloaddition of N-ethyl maleimide to perylene-3,4,9,10-tetracarboxylic acid tetra-iso-butyl ester: synthesis of coronene derivative [141]. Reagents and conditions: (a) p-chloranil, p-hydroxyanisole, rfx (oil bath at 240 °C), 18 h, Y = 2 to 10% (depending on the extent of saponification).
