Disulfide monoxides

The SH group of B HnSH2- can be oxidized to disulfides linking two clusters, and further to the disulfide monoxide [57]. The disulfide has tumor-localizing properties superior to Na2Bi2HnSH [58], In acidic conditions, a free radical with intense blue color is obtained as an intermediate, which can be reduced by NaBI-U... 

The availability of f j-di-r-butyl disulfide monoxide from selective oxidation catalyzed by vanadyl-88 enables the preparation of chiral r-butyl sulfinamides, sulfoxides, and sulfinimines. Very similar reaction conditions bring about the transformation of various 1,3-dithianes to chiral monoxides. (/ ,Rl-2,2,5,5-Tetramethyl-3,4-hexanediol is a chiral ligand for the Ti(IV)-catalyzed oxidation of sulfides with cumene hydroperoxide. ... 

In fact, mercaptan in hair is capable of reacting with disulfide monoxide by nucleophilic displacement [91] or with most compounds that contain a group labile to nucleophilic displacement, if they are capable of diffusing into the hair. 

Disulfide monoxides Thiolsulfinic acid esters Thiosulfinyl esters 40 Thiolsulfinates 5... 

Potassium iodide/hydrogen chloride Disulfide monoxides from disulfoxides... 

Without carbon, the basis for life would be impossible. While it has been thought that silicon might take the place of carbon in forming a host of similar compounds, it is now not possible to form stable compounds with very long chains of silicon atoms. The atmosphere of Mars contains 96.2% CO2. Some of the most important compounds of carbon are carbon dioxide (CO2), carbon monoxide (CO), carbon disulfide (CS2), chloroform (CHCb), carbon tetrachloride (CCk), methane (CHr), ethylene (C2H4), acetylene (C2H2), benzene (CeHe), acetic acid (CHsCOOH), and their derivatives. 

Electronic excitation from atom-transfer reactions appears to be relatively uncommon, with most such reactions producing chemiluminescence from vibrationaHy excited ground states (188—191). Examples include reactions of oxygen atoms with carbon disulfide (190), acetylene (191), or methylene (190), all of which produce emission from vibrationaHy excited carbon monoxide. When such reactions are carried out at very low pressure (13 mPa (lO " torr)), energy transfer is diminished, as with molecular beam experiments, so that the distribution of vibrational and rotational energies in the products can be discerned (189). Laser emission at 5 p.m has been obtained from the reaction of methylene and oxygen initiated by flash photolysis of a mixture of SO2, 2 2 6 (1 )-... 

Chemica.1 Properties. Reviews of carbonyl sulfide chemistry are available (18,23,24). Carbonyl sulfide is a stable compound and can be stored under pressure ia steel cylinders as compressed gas ia equiUbrium with Hquid. At ca 600°C carbonyl sulfide disproportionates to carbon dioxide and carbon disulfide at ca 900°C it dissociates to carbon monoxide and sulfur. It bums with a blue flame to carbon dioxide and sulfur dioxide. Carbonyl sulfide reacts... 

When the Claus reaction is carried out in aqueous solution, the chemistry is complex and involves polythionic acid intermediates (105,211). A modification of the Claus process (by Shell) uses hydrogen or a mixture of hydrogen and carbon monoxide to reduce sulfur dioxide, carbonyl sulfide, carbon disulfide, and sulfur mixtures that occur in Claus process off-gases to hydrogen sulfide over a cobalt molybdate catalyst at ca 300°C (230). 

Titanium carbide may also be made by the reaction at high temperature of titanium with carbon titanium tetrachloride with organic compounds such as methane, chloroform, or poly(vinyl chloride) titanium disulfide [12039-13-3] with carbon organotitanates with carbon precursor polymers (31) and titanium tetrachloride with hydrogen and carbon monoxide. Much of this work is directed toward the production of ultrafine (<1 jim) powders. The reaction of titanium tetrachloride with a hydrocarbon-hydrogen mixture at ca 1000°C is used for the chemical vapor deposition (CVD) of thin carbide films used in wear-resistant coatings. 

Potential Processes. Sulfur vapor reacts with other hydrocarbon gases, such as acetjiene [74-86-2] (94) or ethylene [74-85-1] (95), to form carbon disulfide. Higher hydrocarbons can produce mercaptan, sulfide, and thiophene intermediates along with carbon disulfide, and the quantity of intermediates increases if insufficient sulfur is added (96). Light gas oil was reported to be successflil on a semiworks scale (97). In the reaction with hydrocarbons or carbon, pyrites can be the sulfur source. With methane and iron pyrite the reaction products are carbon disulfide, hydrogen sulfide, and iron or iron sulfide. Pyrite can be reduced with carbon monoxide to produce carbon disulfide. 

Hydrogen sulfide and carbon react at 900°C to give a 70% yield of carbon disulfide (102,103). A process for reaction of coke and hydrogen sulfide or sulfur in an electric-resistance-heated fluidized bed has been demonstrated on a laboratory scale (104). Hydrogen sulfide also forms carbon disulfide in reactions with carbon monoxide at 600—1125°C (105) or carbon dioxide at 350—450°C in the presence of catalysts (106). 

Copolymers of carbon monoxide, carbon dioxide, sulfur dioxide or carbon disulfide are frequently formed in combination with oxiranes, thiiranes or aziridines. Copolymerization of carbon monoxide and ethylenimine was carried out under radiation and the formation of 3-nylon was observed238. ... 

Write formulas for each of the following compounds (a) carbon tetrachloride, (b) carbon disulfide, and (c) carbon monoxide. 

As it is shown above for many cases, dioxides, sulfide oxides and disulfides of carbon decompose upon irradiation into two carbene type fragments. They can recombine if a wavelength is used, which is absorbed by one of the fragments. According to the recombination of two molecules of CS it should also be possible to synthesize S=C=C=0 117, if CS is photochemically excited in the presence of carbon monoxide. 

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