《Enantioselective Twofold C-H Annulation of Formamides and Alkynes without Built-in Chelating Groups》 was written by Chen, Hao; Wang, Yin-Xia; Luan, Yu-Xin; Ye, Mengchun. SDS of cas: 141556-45-8 And the article was included in Angewandte Chemie, International Edition in 2020. The article conveys some information:
Twofold C-H annulation of readily available formamides and alkynes without built-in chelating groups was achieved. Ni-Al bimetallic catalysis enabled by a bulky BINOL-derived chiral secondary phosphine oxide (SPO) ligand proved to be critical for high reactivity and high selectivity. This reaction uses readily available formamides as starting materials and provides a concise synthetic pathway to a broad range of chiral ferrocenes in 40-98% yield and 93-99% ee. After reading the article, we found that the author used 1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8SDS of cas: 141556-45-8)
1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8) is a ligand for arylation of aldehydes and for carbene catalyzed intermolecular arylation of C-H bonds. It is used as a phosphine-free ligand in various metal-catalyzed coupling reactions, often with advantageous results in difficult cases.SDS of cas: 141556-45-8
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem