TY - JOUR A1 - Mori, Atsunori A1 - Fujita, Keisuke A1 - Kubota, Chihiro A1 - Suzuki, Toyoko A1 - Okano, Kentaro A1 - Matsumoto, Takuya A1 - Nishino, Takashi A1 - Horie, Masaki T1 - Formal preparation of regioregular and alternating thiophene–thiophene copolymers bearing different substituents JF - Beilstein Journal of Organic Chemistry PY - 2020/// VL - 16 SP - 317 EP - 324 SN - 1860-5397 DO - 10.3762/bjoc.16.31 PB - Beilstein-Institut JA - Beilstein J. Org. Chem. UR - https://doi.org/10.3762/bjoc.16.31 KW - alternating copolymer KW - nickel(II) catalyst KW - oligosiloxane KW - regioregular polythiophene KW - solubility N2 - Differently substituted thiophene–thiophene-alternating copolymers were formally synthesized employing a halo-bithiophene as a monomer. Nickel-catalyzed polymerization of bithiophene with substituents at the 3-position, including alkyl-, fluoroalkyl-, or oligosiloxane-containing groups, afforded the corresponding copolymers in good to excellent yield. The solubility test in organic solvents was performed to reveal that several copolymers showed a superior solubility. X-ray diffraction analysis of the thin film of the alternating copolymers composed of methyl and branched oligosiloxane substituents was also performed, and the results suggested the formation of a dual-layered film structure. ER -