This focus review summarizes our recent efforts on the synthetic applications of bithiophene dicarbanions generated from three bithiophene isomers: 2,2′‐, 3,3′‐, and 2,3′‐bithiophene. Based on these bithiophene dicarbanions, a series of dithienothiophenes (DTTs) and cyclooctatetrathiophenes (COThs) were synthesized by intra‐ and intermolecular cyclizations, respectively. Moreover, recent applications of DTT and COTh in characteristic compounds such as dendrimers, thio[8]circulenes, double helicenes, and thienoacenes are summarized in this account. Besides the synthetic work, some photoelectric properties of the thiophene‐based oligomers including organic field‐effect transistors and organic photovoltaics are briefly reviewed.

中文翻译：

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基于联噻吩二碳二酮的噻吩低聚物的合成和应用的最新进展

本重点综述总结了我们最近在合成应用中的努力，这些合成物是由三种二噻吩异构体：2,2'-，3,3'-和2,3'-联噻吩生成的。基于这些联噻吩二碳双阴离子，分别通过分子内和分子间环化合成了一系列二噻吩并噻吩（DTT）和环辛四噻吩（COTh）。此外，该文献总结了DTT和COTh在特征化合物如树枝状大分子，硫代[8]环，双螺旋和噻吩并并蒽中的最新应用。除了合成以外，还简要回顾了噻吩基低聚物的一些光电性能，包括有机场效应晶体管和有机光伏电池。