Foreword. Chemical tools for mechanistic studies related to catechol oxidase activity. Oxidation catalysis of microporous metal carboxylate complexes. Copper-catalyzed oxidative coupling of 2,6-dimethylphenol: a radicalar or a ionic polymerization?. Complex catalysts from self repairing ensembles to highly reactive air-based oxidation systems. Mimicking the function of amine oxidases and phenoxazinone synthase by a manganese(IV)-monoradical complex. Design and application of transition metal catalysts for laundry bleach. Carboxylate-bridged dinuclear manganese systems from catalases to oxidation catalysis. Chemical models relevant to nitroalkane-dioxygenase. Mononuclear non-heme iron(III) complexes as functional models for catechol dioxygenases. Heme-peptide complexes as peroxidase models. A brief history of the contribution of metalloporphyrin models to cytochrome P450 chemistry and oxidation catalysis. Bioinspired electrocatalytic reduction of nitric oxide by immobilized heme groups. Structure-activity correlations in highly preorganized dicopper catechol oxidase model systems. Asymmetric dinuclear metal complexes as models for active sites in hydrolases and redox enzymes.