Zhang, Liyan; Jin, Tengda; Guo, Yingjie; Martin, A. C.; Sun, Keju; Dudley, Gregory B.; Yang, Jingyue published an article in 2021. The article was titled 《Synthesis of gem-Dimethylcyclopentane-Fused Arenes with Various Topologies via TBD-Mediated Dehydro-Diels-Alder Reaction》, and you may find the article in Journal of Organic Chemistry.Reference of 2,5-Dibromothiophene The information in the text is summarized as follows:
The development of efficient methods for the synthesis of substituted polycyclic arenes with various topologies is in high demand due to their excellent elec. and optical properties. In this work, a series of gem-dimethylcyclopentane-fused arenes with more than ten topologies were synthesized via a 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD)-mediated dehydro-Diels-Alder reaction with moderate to good yields. The introduction of the near-planar gem-dimethylcyclopentane moiety not only impacts the mol. conjugative system but also regulates the intermol. π-π interactions and crystal packing, which are critical for the photoelec. performance of arenes. The photophys. properties, mol. geometry, mol. packing of these compounds, and electrochem. properties were investigated by UV-vis absorption, fluorescence emission spectra, DFT calculations, single-crystal X-ray structure anal., and cyclic voltammetry study. In the experimental materials used by the author, we found 2,5-Dibromothiophene(cas: 3141-27-3Reference of 2,5-Dibromothiophene)
2,5-Dibromothiophene(cas: 3141-27-3) , is mainly used as pharmaceutical intermediate and synthesis intermediate. 2,5-Dibromothiophene may be used as starting reagent for the synthesis of α,α′-didecylquater-, -quinque- and -sexi-thiophenes.Reference of 2,5-Dibromothiophene
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary