title: Entrainer effect on photochirogenesis in near- and supercritical carbon dioxide: dramatic enhancement of enantioselectivity.
abstract: Diethyl ether added as an entrainer (cosolvent) to near- and supercritical CO2 significantly enhanced the enantioselectivity of photocyclization of 5,5-diphenyl-4-penten-1-ol sensitized by saccharide naphthalenedicarboxylate to give a cyclization product in enantiomeric excesses much larger than those obtained in conventional organic solvents, revealing the unique features of nc- and sc-CO2 as well as the critical role of entrainer clustering to the intervening diastereomeric exciplex pair.
authors.affiliation: Department of Applied Chemistry, Osaka University, Suita 565-0871, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Nishiyama
authors.forename: Takehiko
authors.initials: T
authors.lastname: Wada
authors.forename: Sadayuki
authors.initials: S
authors.lastname: Asaoka
authors.forename: Tadashi
authors.initials: T
authors.lastname: Mori
authors.forename: Taylor A
authors.initials: TA
authors.lastname: McCarty
authors.forename: Nadine D
authors.initials: ND
authors.lastname: Kraut
authors.forename: Frank V
authors.initials: FV
authors.lastname: Bright
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Inoue