Manganese complexes sulfides

C H402, Acetic acid palladium complex, 26 208 tungsten complex, 26 224 C2H7PS, Phosphine sulfide, dimethyl-manganese complex, 26 162 C H,N2, 1,2-Ethanediamine chromium complex, resolution of, 26 24, 27... 

PRuC.mHjj, Ruthenium(II), [2-(diphenyl-phosphino)phenyl-C P](r) -hexamethyl-benzene)hydrido-, 36 182 PSC2H7, Phosphine sulfide dimethyl- and manganese complex, 26 162... 

The use of Mn-salen catalysts for asymmetric epoxidation has been reviewed.30 Oxo(salen)manganese(V) complexes, generated by the action of PhIO on the corresponding Mn(III) complexes, have been used to oxidize aryl methyl sulfides to sulfoxides.31 The first example of C—H bond oxidation by a (/r-oxo (manganese complex has been reported.32 The rate constants for the abstraction of H from dihydroanthracene correlate roughly with O—H bond strengths. 

SPC2H3, Phosphine sulfide, dimethyl-, and manganese complex, 26 162 SPOaCuH , 2//-1,2-Thiaphosphorin-2-ium, 3,4,5,6-tetrakis(methoxycarbonyl)-2,2-dimethyl-, manganese complex,... 

Sulfones. The use of periodic acid to oxidize sulfides (16 examples, 84-99%) is efficiently catalyzed by a binuclear manganese complex. 

Phosphine sulfide, dimethyl-, 26 162 manganese complex, 26 162 Phosphinothioyl cyclo-cotrimerization, 26 161... 

More recently, Katsuki et al. [109] prepared the Salen manganese complex (50) (Figure 1.6), which is efficient in the oxidation of alkyl aryl sulfide with iodosobenzene as oxidant. With 1 mol% of catalyst, they obtained the 2-nitrophenyl methyl sulfoxide in 1 h at -20°C in acetonitrile solution with 90% ee and 88% yield. This is currently one of the best results for catalytic asymmetric sulfoxidation. 

Mn catalysts that show activity in alkene or alcohol oxidation with H2O2 are potentially active in the oxidation of sulfides also. The Mn-tmtacn catalysts and a number of tn-sifu-formed complexes employing ligands such as 39 are examples of such catalysts (see above). These complexes were found to be highly active in the oxidation of sulfides to sulfoxides. For example, the dinudear manganese complex based on tmtacn (6) performs efficiently in the oxidation of aryl alkyl sulfides and generally results in fiJl conversion within 1 h. Unfortunately, as is often the case, in... 

Minerals belonging to the category of insoluble oxide and silicate minerals are many in number. Insoluble oxide minerals include those superficially oxidized and those of oxide type. The former category comprises mainly superficially oxidized sulfide minerals, including metals such as aluminum, tin, manganese, and iron which are won from their oxidic sources. As far as silicate minerals are concerned, there can be a ready reference to several metals such as beryllium, lithium, titanium, zirconium, and niobium which are known for their occurrence as (or are associated with) complex silicates in relatively low-grade deposits. 

Brewer and Spencer [428] have described a method for the determination of manganese in anoxic seawaters based on the formulation of a chromophor with formaldoxine to produce a complex with an adsorption maximum at 450 nm. Sulfide (50 xg/l), iron, phosphate (8 ig/l), and silicate (100pg/l) do not interfere in this procedure. The detection limit is 10 pg/1 manganese. 

Reaction of the manganese tropocoronand complex [Mn(tc-5,5)(NO)] with [Fe(tc-5,5)] results in complete transfer of the NO to the [Fe(tc-5,5)]. Other nitric oxide complexes appear in the sections on nitroprusside (Section S.4.2.2.6 above), on phthalocyanines (Section 5.4.3.7.4 above), and on polynuclear iron-sulfide complexes (Roussin s salts Section 5.4.5.9.2 below) Fe-por-phyrin-NO redox chemistry has been mentioned in Section 5.4.3.7.2 above. 

Little is known concerning the chemistry of nickel in the atmosphere. The probable species present in the atmosphere include soil minerals, nickel oxide, and nickel sulfate (Schmidt and Andren 1980). In aerobic waters at environmental pHs, the predominant form of nickel is the hexahydrate Ni(H20)g ion (Richter and Theis 1980). Complexes with naturally occurring anions, such as OH, SO/, and Cf, are formed to a small degree. Complexes with hydroxyl radicals are more stable than those with sulfate, which in turn are more stable than those with chloride. Ni(OH)2° becomes the dominant species above pH 9.5. In anaerobic systems, nickel sulfide forms if sulfur is present, and this limits the solubility of nickel. In soil, the most important sinks for nickel, other than soil minerals, are amorphous oxides of iron and manganese. The mobility of nickel in soil is site specific pH is the primary factor affecting leachability. Mobility increases at low pH. At one well-studied site, the sulfate concentration and the... 

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