Synthesis and spectral properties of a highly soluble push-pull type of quinoidal thiophenes.
[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.
Takahashi
Toshiaki
T
Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan.
Takimiya
Kazuo
K
Otsubo
Tetsuo
T
Aso
Yoshio
Y