Upgrading of thiophenic compounds from fuels over a silver-modified MoO3 catalyst under ambient conditions was written by Miao, Guang;Chong, Peng;Yang, Cuiting;Liu, Zewei;Yu, Hao;Dong, Lei;Li, Guoqing;Xiao, Jing. And the article was included in Fuel in 2021.SDS of cas: 6287-82-7 This article mentions the following:
The demand for heterocyclic sulfur compounds is increasingly in fine chem. industry, where the thiophenic sulfur impurities in fuels can be a potential recyclable feedstock. In this work, the catalytic upgrading of thiophenic sulfur compounds over a silver-modified MoO3 catalyst under ambient conditions was reported. Br2 and H2O2/HBr were used to convert thiophenic compounds in alkane and alc. solutions The conversion of various thiophenic compounds (thiophene, benzothiophene and dibenzothiophene) to the corresponding bromides reached up to 81.6 ∼ 99.8%. The bromination path undergoes electrophilic substitution mechanism, and the transformation of mono- to dibromides is identified as the rate-determining step. The introduction of MoAg2O4 phase on MoO3 is rationalized to boost the conversion of mono-bromothiophene, which results in the selectivity of 2,5-dibromothiophene increased from 10% to over 50%. The optimized silver loading was 10% due to its high thiophene conversion and selectivity of dibromides. Silver modification of MoO3 rods not only stabilized the textural property of catalysts but also improved its bromination activity compared to the bulk MoO3 indicated by SEM and FTIR characterization. D. functional theory (DFT) calculation suggested that the formation of 2-bromothiphene and 2,5-dibromothiophene were preferred on the MoO3(111) and MoAg2O4(111) sites, resp. The catalytic upgrading approach paves the way for the efficient utilization of thiophenic sulfur impurities in fuels to their value-added under mild conditions. In the experiment, the researchers used many compounds, for example, 2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7SDS of cas: 6287-82-7).
2,3-Dibromobenzo[b]thiophene (cas: 6287-82-7) belongs to benzothiophene derivatives. Benzothiophene is relatively a stable molecule. The electrophilic substitution of benzothiophene systems is much less regioselective than that of indoles. The different substitution patterns in these heterocycles offer new opportunities for drug discovery and other applications in materials science.SDS of cas: 6287-82-7
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem