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Der Confinement‐Effekt von Zeolithen wird von Zhongfang Chen, Anmin Zheng und Mitarbeitern in ihrer Zuschrift auf S. 4631 beschrieben. In der Bildmitte ist das nichtklassische 2‐Norbornyl‐Kation gezeigt, das in eingeschränkten Zeolithkanälen ohne supersaure Umgebung bei Raumtemperatur stabilisiert wird.
Carbonium ions are an important class of reaction intermediates, but their dynamic evolution is difficult to be monitored by in situ techniques under experimental conditions because of their extremely short lifetime. Probably the most famous case is 2‐norbornyl cation (2NB+): its existing form (classical or non‐classical) had been debated for decades, until the concrete proof of non‐classical geometry...
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