37191-15-4Relevant academic research and scientific papers
Synthesis of μ-oxo-bisiron(III)porphyrin compounds and their catalysis for cyclohexane hydroxylation
Guo, Can-Cheng
, p. 182 - 187 (1998)
Fourteen substituted μ-oxo-bis[tetraphenylporphinatoiron(III)] derivants ([TXPPFeIII]2O) were synthesized by passing chlorotetraphenylporphinatoiron(III) (TPPFeIIICl) through a neutral alumina chromatographic column, and nine of which were used in cyclohexane hydroxylation with PhIO as a new type of catalyst under moderate conditions. The experiments have shown that the yields, rate constants k of the cyclohexane hydroxylation have a linear relationship to characteristic constants σ of substituents on porphyrin rings, a physical constant characterizing the electronic effects and steric effects of a substituent group, and that the product distributions and kinetic properties of the reactions are dependent on the reaction temperature, solvent as well as air. In contrast with monoironporphyrin TPPFeIIICl, μ-oxo-bisironporphyrin [TPPFeIII]2O is shown to have the better catalytic power for cyclohexane hydroxylation with PhIO under moderate conditions and stability to PhIO. The research results show that μ-oxo-bisironporphyrin can be used as the model compound of cytochrome P-450 monooxygenase.
Aerobic oxidation of p-xylene over metalloporphyrin and cobalt acetate: Their synergy and mechanism
Jiang, Quan,Xiao, Yang,Tan, Ze,Li, Qing-Hong,Guo, Can-Cheng
, p. 162 - 168 (2009/01/21)
The aerobic liquid-phase oxidation of p-xylene (PX) over metalloporphyrin and Co(OAc)2 was studied, and the co-catalysis between metalloporphyrin and Co(OAc)2 for the oxidation of PX was discovered for the first time. The results showed that both the PX conversion and terephthalic acid yield could be increased significantly despite the fact that only a minute amount of metalloporphyrin was added to the reaction mixture in addition to the Co(OAc)2 catalyst. The effects of the structure of metalloporphyrin and reaction conditions such as temperature, air pressure and catalyst concentration on the overall reaction performance were also studied. A possible mechanism for the observed synergy between metalloporphyrin and Co(OAc)2 as co-catalysts for the aerobic liquid-phase oxidation of PX was proposed based on some experimental observations. The results suggested that the PX oxidation was improved because of the acceleration of the chain initiation of PX oxidation by metalloporphyrin, and the acceleration of the chain initiation itself was due to the ease of peroxide formation over metalloporphyrin.
