Asymmetric counteranion-directed transition-metal catalysis: enantioselective epoxidation of alkenes with manganese(III) salen phosphate complexes was written by Liao, Saihu;List, Benjamin. And the article was included in Angewandte Chemie, International Edition in 2010.HPLC of Formula: 1043567-32-3 This article mentions the following:
Epoxides e. g. I, were prepared through enantioselective epoxidation of olefins catalyzed by Mn-salen complex and chiral phosphate counterion system, which represents another powerful application of the concept of asym. counteranion-directed catalysis. In the experiment, the researchers used many compounds, for example, (11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3HPLC of Formula: 1043567-32-3).
(11bS)-4-Hydroxy-2,6-di(phenanthren-9-yl)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide (cas: 1043567-32-3) belongs to chiral phosphine ligands. The synthesis of novel trialkylphosphines can be quite difficult, thereby limiting the scope of their chiral variants. Chiral phosphine catalysts: Nucleophilic phosphine catalysis often involves the formation of Lewis adducts, namely phosphonium (di)enolate zwitterions, as reaction intermediates.HPLC of Formula: 1043567-32-3
Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis