A Novel Type of Cationic Host Molecules with π-Acceptor Properties


  • This work was supported by the Stiftung Volkswagenwerk, the Fonds der Chemischen Industrie, and BASF AG, Ludwigshafen (FRG).


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Surprisingly, the template effect of a hydrocarbon has been detected for the first time: the yield in the one-pot synthesis of the tetracationic macrocycle 1c is raised from 3–5% to 16% when excess phenanthrene is present. The new phane-like tetracations 1a-c and 2a-c act as π-acceptor host compounds and take up arenes as π-donors in their cavities in a sandwich-like manner.