Highly diastereoselective epoxidation of cholest-5-ene derivatives catalyzed by polymer-supported manganese(III) porphyrins was written by Du, Can-Ping;Li, Zheng-Kai;Wen, Xiang-Min;Wu, Jiang;Yu, Xiao-Qi;Yang, Meng;Xie, Ru-Gang. And the article was included in Journal of Molecular Catalysis A: Chemical in 2004.Electric Literature of C47H36N4O The following contents are mentioned in the article:
Manganese(III) 5,10,15-tris(tolyl)-20-(4-hydroxyphenyl) porphyrin covalently attached to Merrifield’s peptide resin (MPR) was prepared The catalysts exhibit high reactivity and ¦Â-selectivity toward the epoxidation of cholest-5-ene derivatives with PhIO. Under mild reaction conditions, the catalyst was consecutively reused four times without detectable catalyst leaching and gave over 90% epoxide yield and over 99% ¦Â-selectivity. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5Electric Literature of C47H36N4O).
4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. Ligands are classified based on the number of lone pair electrons available for the central metal atom, size and charge like anionic, cationic, neutral, monodentate, bidentate, polydentate ligands. Replacing precious metals with cheaper and more environmentally friendly metals is regarded as a highly desirable goal in the field of catalysis.Electric Literature of C47H36N4O
Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI