Tungsten porphyrins

In related studies of metal ions, Krasnovski learned that the oxides of titanium, zinc, or tungsten possess high photosensitizing activity in redox reactions comparable to the activity of porphyrins and chlorophylls 15). 

Molybdenum catalysts, Ruthenium porphyrins, Ruthenium(lll) complexes, Iron catalysts, Titanium catalysts. Sharpless epoxidation, Tungsten catalysts, Methyltrioxorhenium, Cobalt, Nickel, Platinum, Aerobic epoxidation, Lanthanum, Ytterbium, Calcium, BINOL-complexes. 2008 Elsevier B.v. 

Various metal-metal single o-bonded complexes have been obtained by the reaction of metal carbonyls with metal-carbon o-bonded porphyrins or by the reaction of metal carbonyl anions and chlorometalloporphyrins (Scheme 14). For example, the reaction of dimanganese carbonyl and methyl indium(III) porphyrin gives manganese pen-tacarbonyl indium porphyrin In(Por)Mn(CO)5. The same compound is isolated when chloroindium porphyrin is allowed to react with the manganese pentacarbonyl monoanion. Various iron, cobalt, tungsten, and molybdenum complexes have been prepared by these two methods. 

Rhodium(Il) porphyrins (8) have also been reported to be usable as reversible radical scavengers for control free radical polymerization of acrylic esters (20) under irradiation with a 300-W tungsten bulb. - For example, a benzene solution of 8 (X = Me) has been irradiated (> 350 nm) for several hours to generate the corresponding rhodium(ll) porphyrin (56) (Scheme 12A). Then 20 is vacuum-distilled to the above reaction mixture, whereupon a four-carbon-bridged dimer (57) is formed (Scheme 12B). Upon... 

Porphyrins with all of the Group 6 metals have been investigated as to their electrochemistry, but most data have been obtained for the Cr and Mo complexes [7]. The only porphyrins with a tungsten metal ion whose electrochemistry has been reported are the oxo/hydroxo derivatives (P)WO(OH) [52, 142]. Both metal and ring-centered processes are observed upon reduction of these W(V) porphyrins, and a similar electrochemical behavior has generally been reported for most Cr(V)... 

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