Carbon oxysulphide

Caprylic acid, see Octanoic acid Caprylic alcohol, see 1-Octanol Carbitol, see Diethylene glycol monoethyl ether Carbolic acid, see Phenol Carbon disulphide Carbon monoxide Carbon oxysulphide, see Carbonyl sulphide... 

The reaction of carbon oxysulphide with a-aminonitriles results in 5-amino-2-hydroxy thiazoles these are structurally similar to the 2-mercaptothiazoles but are found to be less stable, readily undergoing cleavage or rearrangement to give 4-thiohydantoins. Thus the reaction between ethyl aminocyanoacetate and carbon oxysulphide 31 in ether afforded 5-amino-2-hydroxy-4-carbethoxythiazole 32, which in the presence of aqueous ammonia was converted into 5-carbethoxy-4-thiohydantoin 33. When using sodium... 

Carbon oxysulphide, see Carbonyl sulphide Carbonyl sulphide 1.07 2.1 ... 

The formation of secondary amines 3 from hindered N,A-disubstituted hydroxylamines by the action of carbon disulphide is thought to proceed by way of the adducts 1, which are in equilibrium with the betaines 2. These break down into the amines 3 and COS2 , which decomposes into the observed by-products carbon oxysulphide and sulphur9. 

Fio. 1. Orbital energy level diagram for carbon oxysulphide using theoretical values (Clementi, 1962). The deeper levels are essentially localized atomic orbitals. The energy scale is in electron volts, expanded on the right to show the valence shell structure. 

When sulphur dioxide alone is passed over carbon at a red heat the latter undergoes partial oxidation, the products being carbon monoxide, carbon oxysulphide and carbon disulphide no oxysulphide is obtained at a white heat.2 Both carbon monoxide and methane are oxidised by sulphur dioxide at high temperatures with formation of sulphur. It has been suggested that volcanic sulphur may, in part, be formed by the reduction of sulphur dioxide by methane, carbon monoxide and hydrogen, all of which are emitted by volcanoes.4... 

Salts and esters of the intermediate thio-acids are known, being prepared from carbon disulphide or carbon oxysulphide. 

Thiolcarbonic Acid, HS.CO.OH, yields carbon oxysulphide, COS, by decomposition its esters yield alcohols or mereaptans when saponified, according to whether the alkyl group is attached to oxygen or to sulphur by this means the constitutions of the thiocarbonic acids are established. 

Carbonyl Sulphide or Carbon Oxysulphide, COS.—Carbonyl sulphide, discovered by Than,5 is formed synthetically when a mixture of sulphur vapour and carbon monoxide is passed through a hot tube. The action is reversible,... 

The formula of carbon dioxide is C02, that of carbon disulphide CS2 and it is evident that an intermediate substance should exist of the formula COS. This substance is carbon oxysulphide. It is a gas, prepared by heating thiocyanic acid, HSCN, the ammonium salt of il which is produced when ammonia is passed through a mixture of carbon disulphide and alcohol CS2 + 2NHg.Alc = H2S + (NH4) SCN.Alc. On evaporation of the alcohol the ammonium thiocyanate crystallises out. This salt, distilled with sulphuric acid, yields in passing the acid HSCN, which, on account of the high temperature, reacts with water, forming ammonia (which yields ammonium sulphate with the sulphuric acid) and carbon oxysulphide, COS HSCN + H20 = NHS + COS. 

From hydrogen sulphide and carbon monoxide Carbon oxysulphide and carbon monosulphide ... 

Applying to the case considered on p. 218 ot decomposition of carbon oxysulphide,... 

Aryl monothiolcarbonates have been obtained in 60% yield from a potassium phenolate in dioxan/dimethyl sulphoxide and carbon oxysulphide during 3 hours at ambient temperature foliowed by alkylation with a primary halide (PrI) as shown (ref.23). 

The meso-ionic 1,3-dithiolium 4-olate (283 R = SMe) exists in equilibrium with the dimer (284 R = SMe). Complete regiospecificity is observed in the 1,3-dipolar cycloaddition of styrene to the diphenyl-derivative (283 R = Ph), which gives only compound (285 R = H,R = Ph) in contrast, methyl acrylate yields a mixture of (285 R = C02Me, R = H) and the isomeric adduct (285 R = H, R = C02Me)/ Irradiation of the diphenyl-compound (283 R = Ph) yields a mixture of 4,5-diphenyl-l,2-dithiole-3-thione (286) via the bridged intermediate shown), sulphur, diphenylacetylene, tetraphenylthiophen, and the latter s precursor, the dithiin (287). The dithiin is thought to arise from the dimeric compound (284 R = Ph) by loss of carbon oxysulphide. ... 

The nitrones (119) are readily converted into thiolactams (120) by heating under reflux in carbon disulpWde. The reaction presumably involves an initial cycloaddition and subsequent cycloreversion with the loss of carbon oxysulphide. 

The method, in which a fivefold excess of hydrogen sulphide does not interfere, was used for the analysis of the atmosphere, exhalations, and wastes in the fibre industry. In an analogous way carbon oxysulphide can be determined. 

A general approach to both saturated and unsaturated thioesters consists of reaction between phosphorus ylides and carbon oxysulphide (Scheme 46). °... 

Further investigations into the reactisulphur atoms with olefins to yield thiirans have established absolute rate constants and a n ative temperature dependence on the rate constants for the reaction of sulphur in its state, obtained by flash i otolysis of carbon oxysulphide, with... 

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