Polyhalogenated metalloporphyrins

More recently, even more robust and more reactive polyhalogenated metalloporphyrins bearing electron-withdrawing substituents on the P-pyrrole positions (Fig.2) have been prepared and used as efficient oxidation catalysts 6-10. The three following examples illustrate the better catalytic activities of these third generation metalloporphyrins. 

The activity of the liquid phase polyhalogenated metalloporphyrins (Co, Mn, Fe) and supported catalysts (silica, polystyrene) and the cationic metalloporphyrins encapsulated in NaX zeolite are founded to be active for cyclooctane oxidation with molecular into ketone and alcohol with primary ketone formation. At the last case the ration c-one/c-ol is higher than at the use supported on silica and polystyrene catalysts and in fact coincide with results, which are received with the cationic metalloporphyrins in solution. [54]. 

Both polymeric polyhalogenated iron porphyrins [338] and polyhalogenated metalloporphyrins covalently bound to polymeric supports [339] have been shown to be efficient catalysts for hydroxylation and epoxidation, consistent with the results reviewed in 6.12.1. 

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