Sulfur monoxide complexes

A flow diagram for the system is shown in Figure 5. Feed gas is dried, and ammonia and sulfur compounds are removed to prevent the irreversible buildup of insoluble salts in the system. Water and soHds formed by trace ammonia and sulfur compounds are removed in the solvent maintenance section (96). The pretreated carbon monoxide feed gas enters the absorber where it is selectively absorbed by a countercurrent flow of solvent to form a carbon monoxide complex with the active copper salt. The carbon monoxide-rich solution flows from the bottom of the absorber to a flash vessel where physically absorbed gas species such as hydrogen, nitrogen, and methane are removed. The solution is then sent to the stripper where the carbon monoxide is released from the complex by heating and pressure reduction to about 0.15 MPa (1.5 atm). The solvent is stripped of residual carbon monoxide, heat-exchanged with the stripper feed, and pumped to the top of the absorber to complete the cycle. 

The greater lability of 1-benzothiepin 1-oxides, compared to the parent compounds, may lead to differences in chemical behavior. Thus, treatment of the tricarbonyliron complex of 1-benzo-thiepin 1-oxide (8, X = SO) with ammonium cerium(IV) nitrate in acetone at — 30 °C leads, with the loss of sulfur monoxide, to naphthalene. In contrast, the iron ligand can be removed selectively from the corresponding 1-benzothiepin by ammonium cerium(IV) nitrate.23 92 For the synthesis of 1-benzothiepin 1-oxide, see Section 2.1.4.1,... 

Episulfides can be converted to alkenes. " However, in this case the elimination is syn, so the mechanism cannot be the same as that for conversion of epoxides. The phosphite attacks sulfur rather than carbon. Among other reagents that convert episulfides to alkenes are Bu3SnH, certain rhodium complexes, LiAlH4 (this compound behaves quite differently with epoxides, see 10-85), and methyl iodide.Episulfoxides can be converted to alkenes and sulfur monoxide... 

The sulfur-rich oxides S 0 and S 02 belong to the group of so-called lower oxides of sulfur named after the low oxidation state of the sulfur atom(s) compared to the best known oxide SO2 in which the sulfur is in the oxidation state +4. Sulfur monoxide SO is also a member of this class but is not subject of this review. The blue-green material of composition S2O3 described in the older literature has long been shown to be a mixture of salts with the cations S4 and Ss and polysulfate anions rather than a sulfur oxide [1,2]. Reliable reviews on the complex chemistry of the lower sulfur oxides have been published before [1, 3-6]. The present review deals with those sulfur oxides which contain at least one sulfur-sulfur bond and not more than two oxygen atoms. These species are important intermediates in a number of redox reactions of elemental sulfur and other sulfur compounds. 

The binding of sulfur and/or an activated intermediate of the phosphorus-containing portion of the parathion molecule to the endoplasmic reticulum leads to a decrease in the amount of cytochrome P-450 detectable as its carbon monoxide complex and to a decrease in the rate of metabolism of substrates such as benz-phetamine ( 19). Neither paraoxon nor any other isolatable metabolite of parathion decreases the amount of cytochrome P-450 or inhibits the ability of microsomes to metabolize substrates such a benzphetamine (19). 

Sulfur ligands, 633-655 coordination ability, 516 Sulfur monoxide metal complexes instability, 636 Superoxide dismutase, 773 copper complexes, 772 Superoxo complexes, 315-330 binuclear, 323, 325 reactions, 330 bridged... 

S. M. Aldoshin (Director). This session included four presentations. Professor N.P. Konovalova reported on antioxidants and donors of nitrogen monoxide (antitumor effects of nitroxides and NO-donors) the report of N.A. Sanina and S.M. Aldoshin was concerned with a new class of NO-donors (synthesis, structure, properties, and practical use of sulfur-nitrosyl complexes of iron). Free-radical mechanisms of induction and development of secondary necrosis after gun wounds were the subject of the lecture by G.N. Bogdanov L.D. Smirnov reported on pharmacological properties and promising clinical application of antioxidants of the heteroaromatic array. 

The coordination chemistry of NS (thionitrosyl), thiazate (NSO ), disulfidothionitrate (SsN"), sulfur monoxide (SO), disulfur monoxide (S2O), SO2, DMSO, thiosulfate, sulfite, and thiourea ligands is extensive. " Scheme 23 illustrates their coordination modes and some of the complexes that can be generated. 

The photooxidation of CS2 and COS has also been examined in flash photolysis studies. The spectra of a number of sulfur oxides have been detected. Both SO2 and SO have been definitely identified A system of absorption bands appearing between 2500 and 2400 A. have been assigned to the sulfur monoxide molecule, S2O, on the basis of mass spectrometric evidence. A transient spectrum observed in the wavelength region, 1840-1740 A., has been tentatively assigned to a short-lived isomeric form of sulfur dioxide, the structure of which may be SOO, sulfur superoxide. The probable precursor of all these species is the sulfur monoxide which arises from the reaction of atomic sulfur with O2. The overall reaction is complex a number of possible steps have been postulated to account for the intermediates, SO and SOO, as well as for the final products S2O and SO2. With triplet sulfur atom, the most likely reaction to produce SO is S( P) -H Ojf S,-) S0(32 ) -I- 0(V) (43)... 

Carbon disulfide—sulfur dioxide complex Carbon monoselenide Carbon monosulflde Carbon monoxide Carbon monoxide dimer-water complex Carbon oxyselenide Carbon oxysulfide Carbon oxysulfide—carbon dioxide dimer complex Carbon oxysulfide—water complex... 

In both cases the oxidative addition is accompanied by deavage of the Fe-Fe bond and the formation of complex with bridging Ji2-Cl or p3-SO ligmds.I43 Other syndieses of complexes wifli coordinated sulfur monoxide have also been described, Eq. 8.45 and Eq. 8.46 ... 

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