Tris , transition metal peroxides

N-Methyl-N, N, N -tris(2-pyridylmethyl) ethane-1,2-diamine, transition metal peroxides, 1072... 

Tris(2-pyridylmethyl)amine (TPA), transition metal peroxides, 1117... 

Several compounds of tungsten, which is a transition metal closely related to molybdenum, are able to catalyze the selective oxidation of secondary alcohols with hydrogen peroxide as secondary oxidant. These include tris(cetylpyridinium) 12-tungstophosphate,33 peroxotungstopho-sphate (PCWP)34 and Na2W04 in the presence of a phase transfer catalyst.35 Tungstophosphoric acid is able to catalyze the selective oxidation of secondary alcohols in the presence of ferric nitrate as secondary oxidant.36... 

Olefin epoxidation has many features in common with biological monooxygenation. This reaction requires heterolysis of the peroxide bond. The presence of carbonyl groups facilitates heterolysis in peracids. Epoxidation occurs through electrophilic attack, so di- and tri-substituted double bonds are more easily epoxidized. In the presence of metal complex catalysts, epoxidation proceeds under mild conditions because in the transition state the 0-0 bond is more easily heterolyzed (Eq. 12-29). 

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