Thermodynamic Locking of Conformational Chirality in a [9]Cycloparaphenylene
Herein, we report the thermodynamic locking of conformational chirality in a [9]cycloparaphenylene (CPP) by external appending of (R)- or (S)-BINOL units. Through-space steric interactions induce asymmetric torsion in the CPP backbone, generating a strained nanohoop with the lowest-energy conformer (ΔG = −2.9 kcal mol–...