Abstract
Macrocyclic molecules with chirality have been studied because of their wide applications in the field of chiral recognition, chiroptical materials, and asymmetric catalysis. Planar chirality of pillar[n]arenes also contributes to many applications. Without bulky substituents, racemization occurs between pillar[n]arene enantiomers. Pillar[5]arenes with stable planar chirality have been formed by introducing bulky substituents into the pillar[5]arene rims. However, pillar[6]arene enantiomers that show stable planar chirality by introducing bulky conjugated moieties have not been reported. Herein, we report stable planar chirality of pillar[6]arene by introducing biphenyl groups into one benzene unit of pillar[6]arene. The enantiomers show thermo-responsive circular dichroism signals without racemization.
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