5,5'-Bis[5-(9-decyl-9H-carbazol-3-yl)thien-2-yl]-4H, 4‘H-[3,3'-bi(1,2,6-thiadiazine)]-4,4'-dione

Stille coupling of 5,5'-dichloro-4H,4‘H-[3,3'-bi(1,2,6-thiadiazine)]-4,4'-dione (8) with 9-decyl-3-[5-(tributylstannyl)thien-2-yl]-9H-carbazole and Pd(Ph3P)2Cl2 in PhMe, at ca. 110 °C, for 2 h, gave 5,5'-bis[5-(9-decyl-9H-carbazol-3-yl)thien-2-yl]-4H,4‘H-[3,3'-bi(1,2,6-thiadiazine)]-4,4'-dione (7) in 51% yield. The latter is investigated as an oligomer donor for organic photovoltaics.