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The potential of a dicationic strontium  ansa ‐arene complex for Lewis acid catalysis has been explored. The key to its synthesis was a simple salt metathesis from SrI 2  and 2 Ag[Al(OR F ) 4 ], giving the base‐free strontium‐perfluoroalkoxyaluminate Sr[Al(OR F ) 4 ] 2  (OR F =OC(CF 3 ) 3 ). Addition of an  ansa ‐arene yielded the highly Lewis acidic, dicationic strontium  ansa ‐arene complex. In preliminary experiments, the complex was successfully applied as a catalyst in CO 2 ‐reduction to CH 4  and a surprisingly controlled isobutylene polymerization reaction.

A Highly Lewis Acidic Strontium ansa ‐Arene Complex for Lewis Acid Catalysis and Isobutylene Polymerization