title: Double lactonization in triarylamine-conjugated dimethyl diethynylfumarate: formation of intensely colored and luminescent quadrupolar molecules including a missing structural isomer of Pechmann dyes.
abstract: Acid-induced double lactonization in triarylamine-conjugated dimethyl diethynylfumarate E-1 opens up a new synthetic route to Pechmann dyes. This one-pot reaction affords three donor-acceptor-donor quadrupolar molecules (P(55)-1, P(66)-1, and P(56)-1); P(56)-1 comprises a missing structural isomer of Pechmann dyes. They are intensely colored and brightly luminescent. An organic field-effect transistor device fabricated with P(66)-1 functions as a p-type semiconductor.
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Mikihiro
authors.initials: M
authors.lastname: Hayashi
authors.forename: Fumiyuki
authors.initials: F
authors.lastname: Toshimitsu
authors.forename: Ryota
authors.initials: R
authors.lastname: Sakamoto
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nishihara