title: Role of entropy in supramolecular photochirogenesis: enantiodifferentiating photoisomerization of cyclooctenes in chiral sensitizer-immobilized MCM-41 cavities.
abstract: To examine the effects of confinement, or low-entropy environments, we employed the mesoporous silicate MCM-41 modified with optically active benzenetetracarboxylates as chiral reaction media to effect the enantiodifferentiating photoisomerization of (Z)-cyclooctene and (Z,Z)-1,5-cyclooctadiene. The ee of the (E)-isomer produced and its temperature dependence behavior in MCM-41 were completely different from those observed in homogeneous solutions. Immobilizing the sensitizer in MCM-41 reduced the contribution of the entropy factor.
authors.affiliation: Department of Applied Chemistry Osaka University, Suita, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Maeda
authors.forename: Takehiko
authors.initials: T
authors.lastname: Wada
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kusaka
authors.forename: Tadashi
authors.initials: T
authors.lastname: Mori
authors.forename: Masakazu
authors.initials: M
authors.lastname: Iwamoto
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Inoue