title: Planar-chiral pillar[5]arene: chiral switches induced by multiexternal stimulus of temperature, solvents, and addition of achiral guest molecule.
abstract: We synthesized chiral-substituents modified pillar[5]arene for the first time. The chiral-substituents modified pillar[5]arene showed planar chirality and interconversion between (pS) and (pR) forms took place quickly. The planar chirality was switched by temperature, solvents, and addition of achiral guest. As the measurement temperature increased, the diastereomeric excess was decreased. The diastereomeric excesses were high in low-permittivity solvents, while a low diastereomeric excess was observed in high-permittivity solvents. Addition of achiral guest induced an increase of negative CD intensities.
authors.affiliation: Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan.
authors.forename: Tomoki
authors.initials: T
authors.lastname: Ogoshi
authors.forename: Ryohei
authors.initials: R
authors.lastname: Shiga
authors.forename: Tada-aki
authors.initials: TA
authors.lastname: Yamagishi
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Nakamoto