Oxometal cations

Homolytic cleavage of the peroxodimetal complex to oxometal cation radical species may also take place, particularly in the case of iron porphyrin systems. The oxometals are reactive intermediates, affording ju-oxodimetal complexes via two routes [358] ... 

X- and c-values were determined for many metal ions, plus the proton, certain organometal ions and neutral or cationic oxometal species like and... 

Improve at the same time the structural stability of the HPC and its oxidation potential, by using stable salts and by adding transition metal ions which are known to enhance the oxidation potential of the oxometal, such as low-valence early transition metal ions in the cationic position of the HPC, or vanadium as an additional oxometal. 

Alternatively, the reactive oxometal(IV) porphyrin cation radical (25) may attack the ligand or any oxidizable substrate present. This leads to catalytic cycles to be discussed in the subsequent chapters of this book. 

Another kind of metalloporphyrin catalyzed olefin epoxidation utilizes aldehydes, which generate peroxy radicals and subsequently peroxy acids [95,98,258]. The latter are complexed by the metalloporphyrin and serve as sources of 0-atoms for epoxidation either as the peroxy acid complex or as the oxidized ir-cation radical (oxometal species) [96,97]. The catalysis of propene epoxidation by... 

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