title: From π-expanded coumarins to π-expanded pentacenes.
abstract: The synthesis of two novel types of π-expanded coumarins has been developed. Modified Knoevenagel bis-condensation afforded 3,9-dioxa-perylene-2,8-diones. Subsequent oxidative aromatic coupling or light driven electrocyclization reaction led to dibenzo-1,7-dioxacoronene-2,8-dione. Unparalleled synthetic simplicity, straightforward purification and superb optical properties have the potential to bring these perylene and coronene analogs towards various applications.
authors.affiliation: Institute of Organic Chemistry PAS, Kasprzaka 44/52, 01-224 Warsaw, Poland. dtgryko@icho.edu.pl.
authors.forename: Marek K
authors.initials: MK
authors.lastname: Węcławski
authors.forename: Mariusz
authors.initials: M
authors.lastname: Tasior
authors.forename: Tommy
authors.initials: T
authors.lastname: Hammann
authors.forename: Piotr J
authors.initials: PJ
authors.lastname: Cywiński
authors.forename: Daniel T
authors.initials: DT
authors.lastname: Gryko