title: Photochromic dithienylethenes with extended pi-systems.
abstract: The syntheses and photochromic properties of six new photochromic dithienylethenes with differently substituted conjugated double bonds at the thiophene units are presented.
authors.affiliation: Organische Chemie I, Universität Bielefeld, Postfach 100131, 33501, Bielefeld, Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Tosic
authors.forename: Kai
authors.initials: K
authors.lastname: Altenhöner
authors.forename: Jochen
authors.initials: J
authors.lastname: Mattay