Unsymmetrical Thienopentalenes: Synthesis, Optoelectronic Properties, and (Anti)aromaticity Analysis was written by Gazdag, Tamas;Mayer, Peter J.;Kalapos, Peter Pal;Holczbauer, Tamas;El Bakouri, Ouissam;London, Gabor. And the article was included in ACS Omega in 2022.Application of 6287-82-7 This article mentions the following:
The synthesis and properties of a series of unsym. thienopentalenes are explored, including both monoareno and diareno derivatives For the synthesis of monoareno pentalenes, a carbopalladation cascade reaction between alkynes and gem-dibromoolefins was applied. Diareno pentalene derivatives were accessed via gold-catalyzed cyclization of diynes. Thiophene was fused to pentalene in two different geometries via its 2,3 and 3,4 bonds. 2,3-Fusion resulted in increased antiaromaticity of the pentalene unit compared to the 3,4-fusion both in the monoareno and diareno framework. Monothienopentalenes that contained the destabilizing 2,3-fusion could not be isolated. For diareno derivatives, the aromatic character of the different aryl groups fused to the pentalene was not independent. Destabilizing fusion on one side resulted in alleviated aromaticity on the other side and vice versa. The synthesized mols. were characterized exptl. by 1H NMR and UV-vis spectroscopies, cyclic voltammetry, and X-ray crystallog., and their aromatic character was assessed using magnetic (NICS and ACID) and electronic indexes (MCI and FLU). In the experiment, the researchers used many compounds, for example, 2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7Application of 6287-82-7).
2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7) belongs to benzothiophene derivatives. Benzothiophene is relatively a stable molecule. The core structure is a part of various pharmaceutical substances and natural products. Due to its aromaticity, thiophenes do not exhibit the same properties as conventional thioethers.Application of 6287-82-7
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem