Manganeseporphyrins immobilized on silica microspheres as biomimetic catalysts hydroxylating cyclohexane with molecular oxygen was written by Cai, Jin-Hua;Huang, Jin-Wang;Yu, Han-Cheng;Ji, Liang-Nian. And the article was included in Journal of Sol-Gel Science and Technology in 2011.Electric Literature of C47H36N4O The following contents are mentioned in the article:
Three types of silica microspheres immobilizing Mn(III) porphyrins appending p-CH3, p-H and p-Cl Ph substituents (designated as MnMP-S-SiO2, MnPP-S-SiO2 and MnCP-S-SiO2, resp.) have been synthesized and characterized using SEM, IR, UV-vis and TG. The SEM images show that the morphol. of the silica microspheres is spheriform with ca. 2-4 ¦Ìm diameter The catalytic performances of various supported biomimetic catalysts for the hydroxylation of cyclohexane in the presence of mol. oxygen under mild conditions have been investigated and compared detailedly. The exptl. results confirmed that the catalytic efficiencies of these silica microspheres are much higher than those of the free Mn(III) porphyrin analogs and follow the order of MnMP-S-SiO2 > MnPP-S-SiO2 > MnCP-S-SiO2. All these results indicate that the grafting particles can not only protect metalloporphyrin from oxidation, but also promote it to activate O2. They are mild, reusable and highly efficient heterogeneous catalyst for the epoxidation of cyclohexene. The effect of substituent groups was also discussed. 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. Ligand design occupies a central place in organic synthesis and catalysis. The ability of ligands to engender a variety of useful properties of organometallic complexes is the major enabling force for the discovery of new catalytic reactions, activation of small molecules, dramatically enhanced reactivity.Electric Literature of C47H36N4O
Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI