title: A 2:1 coupling reaction of arynes with aldehydes via o-quinone methides: straightforward synthesis of 9-arylxanthenes.
abstract: [reaction: see text] A novel coupling reaction, where an aldehyde and two molar amounts of an aryne are assembled selectively, has been demonstrated to afford diverse 9-arylxanthene derivatives in one step. o-Quinone methide arising from the [2 + 2] cycloaddition of an aldehyde with an aryne was postulated as a transient intermediate.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan. yhiroto@hiroshima-u.ac.jp
authors.forename: Hiroto
authors.initials: H
authors.lastname: Yoshida
authors.forename: Masahiko
authors.initials: M
authors.lastname: Watanabe
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Fukushima
authors.forename: Joji
authors.initials: J
authors.lastname: Ohshita
authors.forename: Atsutaka
authors.initials: A
authors.lastname: Kunai