title: Synthesis and spectral properties of a highly soluble push-pull type of quinoidal thiophenes.
abstract: [structures: see text] A series of push-pull quinoidal thiophenes 5a,b and 6a-c substituted with an electron-donating 1,3-dithiol-2-ylidene unit and an electron-withdrawing dicyanomethylene unit at the terminals is developed. They are highly soluble in common solvents and deeply colored with extension of the thienoquinoid skeleton.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Takahashi
authors.forename: Kazuo
authors.initials: K
authors.lastname: Takimiya
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Otsubo
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Aso