During a recent investigation into the chemistry of oligofurans (polymers of the furan
Chapter 17, Problem 17.73(choose chapter or problem)
During a recent investigation into the chemistry of oligofurans (polymers of the furan heterocycle, which show potential to be used in materials), the investigators observed an interesting reaction with dienophiles. When trifuran (below) is treated with maleimide, only the terminal furan participates in a [4+2] reaction (Org. Lett. 2012, 14, 502505). Provide a reasonable explanation for this observation. O O O HN O O O H N O O O O O O O Not observed Exclusive product N
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