The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《CuSO4-Catalyzed Tandem C(sp3)-H Insertion Cyclization of Toluenes with Isonitriles to Form Indoles》. Authors are Shan, Xiang-Huan; Wang, Mei-Mei; Tie, Lin; Qu, Jian-Ping; Kang, Yan-Biao.The article about the compound:1-(Bromomethyl)-2-iodobenzenecas:40400-13-3,SMILESS:BrCC1=C(I)C=CC=C1).COA of Formula: C7H6BrI. Through the article, more information about this compound (cas:40400-13-3) is conveyed.
A CuSO4-catalyzed tandem benzylic C-H insertion cyclization of toluene derivatives and isonitriles is described. The naturally abundant salt CuSO4 serves as a low-cost ligand-free redox catalyst. This reaction provides a practical modular synthesis of N-aryl indoles from isonitriles.
There are many compounds similar to this compound(40400-13-3)COA of Formula: C7H6BrI. if you want to know more, you can check out my other articles. I hope it will help you，maybe you’ll find some useful information.
Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate