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Eine Reihe redox‐responsiver, Ferrocenyl‐substituierter Borane und Boronsäureester wurde dargestellt. Oxidation der Ferrocenyl‐Einheit zum entsprechenden Ferrocenium führte zu einer drastischen Erhöhung der Lewis‐Acidität, wobei sogar die des SbF5 übertroffen wird. Dies wurde sowohl experimentell als auch durch quantenchemische Rechnungen untersucht. Die resultierenden, stark Lewis‐aciden Borverbindungen...
One‐electron oxidation converts the ferrocene‐substituted borane into a Lewis superacid, as reported by Frank Breher, Jan Paradies, and co‐workers in their Communication (e202216959). The Lewis superacid activates almost inert carbon–fluorine and sulfur–fluorine bonds for reductions, alkylations, and arylations to form new chemical bonds.
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