The present invention is directed to proton exchange membranes such as for use in fuel cells. In one embodiment, a polyetherquinoxaline is obtained by reaction between a haloquinoxaline and at least one diol, which forms a repeating unit including an ether linkage. The polyetherquinoxaline is suitable for use in a proton exchange membrane, which can be used in a fuel cell.
Rhodium‐Catalyzed Intramolecular Cyclization and Rearrangement of 1‐Azido‐2‐(2,2‐Dihalovinyl)arenes and 1‐Azido‐2‐[(2,2‐Dihalovinyl)(Boc)amino]arenes for the Preparation of 2,3‐Dihaloindoles and 2‐Haloquinoxalines
作者:Teppei Abe、Kazuki Kobayashi、Seiya Kikukawa、Yuuki Kanai、Takeshi Hata
DOI:10.1002/adsc.202300885
日期:2023.12.19
Treatment of 1-azido-2-(2,2-dihalovinyl)arenes with a catalytic amount of Rh2(esp)2 afforded various 2,3-dihaloindoles in 51–74% yields. This reaction progressed via the intramolecularcyclization of rhodium nitrene generated in situ and the rearrangement of one halogen group. For the 2-chloro-2-iodovinyl group, the iodo group selectively rearranged to yield 2-chloro-3-iodoindoles as single isomers