Thienopyrrole-dione (TI) end capped materials have recently emerged as polymorphic molecular semiconductors suitable as active layers of ambipolar light emitting transistors, photovoltaic cells and time temperature integrator devices. Here, we report the synthesis of a new derivative, namely 2, 2'-([2, 2'-Bithiophene]-5, 5'-diyl) bis (5-octyl-4-phenyl-4H-thieno [2, 3-c] pyrrol-6 (5H)-one)(R-NT4N), having monoreduced TI moiety (R-TI) end groups. Ring opening of TI moiety by Grignard reagent addition followed by one-pot reduction/ring ...