Abstract
ABSTRACT Herein we report the successful synthesis and isolation of tiara[6]arene, a constitutional isomer of calix[6]arene consisting of six phenol units linked by para-substituted methylene bridges, from an isomeric mixture of asymmetrically substituted pillar[6]arene intermediates. Similar to its pentameric analogue, tiara[6]arene displays high conformational freedom in solution and rich polymorphism in the solid state. The establishment of the tiara[n]arene family (n = 5 and 6) further expands the scope of macrocyclic chemistry.
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