title: Structurally versatile novel photochromic bisarylindenone and its acetal: achievement of large cyclization quantum yield.
abstract: Bisarylindenones and an acetal derivative, a novel thermally irreversible photochromic family based on 6pi-electrocyclization with three easily modifiable functional groups, have been synthesized. 2,3-Bis(5-methyl-2-phenyl-4-thiazolyl)indenone showed photochromic back-and-forth reactions with two different visible lights. Its ethylene acetal recorded 0.81 as the photocyclization quantum yield in hexane, which is the largest value known to date for 6pi-electrocyclization in solution.
authors.affiliation: Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University, Tokiwadai, Hodogaya, Yokohama 240-8501, Japan.
authors.forename: Kaori
authors.initials: K
authors.lastname: Morinaka
authors.forename: Takashi
authors.initials: T
authors.lastname: Ubukata
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Yokoyama