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Eine Cyclisierungskaskade durch Ringöffnung von Polyepoxiden führt in saurem wässrigem Medium zu Tetrahydrofuran(THF)‐, in neutralem Wasser hingegen zu Tetrahydropyran(THP)‐Ringen. Y. Morimoto und Mitarbeiter beschreiben diesen Wechsel in ihrer Zuschrift auf S. 10274. Im Titelbild steht eine Schienenweiche für diesen divergierenden Verlauf der Polyepoxid‐Cyclisierung, wobei der rechte Waggon die THP‐Bildung...
Biomimetic epoxide‐opening cascades of polyepoxides enable the efficient and rapid construction of polyether frameworks. Herein, we show that the epoxide‐opening cascade cyclization that affords tetrahydrofuran products in acidic aqueous media produces tetrahydropyran (THP) in neutral water. THP formation proceeded by simply heating polyepoxides in neutral water and followed a different cyclization...
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