title: Triflic acid mediated cascade cyclization of aryldiynes for the synthesis of indeno[1,2-c]chromenes: application to dye-sensitized solar cells.
abstract: A new triflic acid (TfOH)-mediated cascade cyclization of ortho-anisole-substituted aryldiynes is described for the construction of indeno[1,2-c]chromenes. The cascade cyclization proceeds through an unusual TfOH-induced alkyne-alkyne cyclization followed by nucleophilic attack of the methoxy group on the benzylidene cation, which is completely different to the cyclization of ortho-aniline- or ortho-thioanisole-substituted aryldiynes. A new class of organic dyes with the indeno[1,2-c]chromene framework as both donor and π-linker were synthesized. These compounds exhibit high photovoltaic performances in dye- sensitized solar cells (DSCs).
authors: State Key Laboratory of Fine Chemicals and School of Chemistry, Dalian University of Technology, Dalian 116023 (China); WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1, Aoba-ku Katahira, Sendai 980-8577 (Japan).
authors: Hua
authors: H
authors: Jiang
authors: Giovanni
authors: G
authors: Ferrara
authors: Xuan
authors: X
authors: Zhang
authors: Kazuaki
authors: K
authors: Oniwa
authors: Ashraful
authors: A
authors: Islam
authors: Liyuan
authors: L
authors: Han
authors: Ying-Ji
authors: YJ
authors: Sun
authors: Ming
authors: M
authors: Bao
authors: Naoki
authors: N
authors: Asao
authors: Yoshinori
authors: Y
authors: Yamamoto
authors: Tienan
authors: T
authors: Jin
keywords: aryldiynes; cyclization; domino reactions; indeno[1,2-c]chromenes; organic dyes; triflic acid