《Approaching the Integer-Charge Transfer Regime in Molecularly Doped Oligothiophenes by Efficient Decarboxylative Cross-Coupling》 was published in Angewandte Chemie, International Edition in 2020. These research results belong to Liu, Jiang Tian; Hase, Hannes; Taylor, Sarah; Salzmann, Ingo; Forgione, Pat. Synthetic Route of C4H2Br2S The article mentions the following:
A library of sym. linear oligothiophene was prepared employing decarboxylative cross-coupling reaction as the key transformation. Thiophene potassium carboxylate salts were used as cross-coupling partners without the need of co-catalyst, base, or additives. This method demonstrates complete chemoselectivity and is a comprehensive greener approach compared to the existing methods. The modularity of this approach is demonstrated with the preparation of discreet oligothiophenes with up to 10 thiophene repeat units. Sym. oligothiophenes are prototypical organic semiconductors where their mol. elec. doping as a function of the chain length can be assessed spectroscopically. An oligothiophene critical length for integer charge transfer is 10 thiophene units, highlighting the potential use of discrete oligothiophenes as doped conduction or injection layers in organic electronics applications. The results came from multiple reactions, including the reaction of 2,5-Dibromothiophene(cas: 3141-27-3Synthetic Route of C4H2Br2S)
2,5-Dibromothiophene(cas: 3141-27-3) , is mainly used as pharmaceutical intermediate and synthesis intermediate. 2,5-Dibromothiophene may be used in the preparation of soluble α,ω-diformyl-a-oligothiophenes.Synthetic Route of C4H2Br2S
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary