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The biomimetic oxidation of curcumin, a main turmeric pigment with hydrogen peroxide catalyzed by different 5,10,15,20-tetraarylporphyrinatoiron(III) chlorides [TAPFe(III)Cl] in dichloromethane has been studied to give a C-C coupled curcumin dimer in 40-70% yield. The structure of the dimer has been elucidated by (1)H-, (13)C-NMR, IR and FAB-Mass spectroscopic data.

Biomimetic Oxidation of Curcumin with Hydrogen Peroxide Catalyzed by 5,10,15,20-Tetraarylporphyrinatoiron(III) Chlorides in Dichloromethane