Hydrogen sulfide reducing action

Bromodichloronitrosomethane. BrCCl2NO, mw 192.84, N 7.26% it is a dark blue liq of unpleasant odor, fr p -80° bp 21° at 24mm. It is prepd by the action of Br and Na acetate on phosgene oxime (C CiNOH). It decomps on attempted distn at atm press. It is reduced to phosgene oxime with hydrogen sulfide in Me ale, and warming with Br produces dichlorodibromo-methane... 

Silver(I) Sulfide. The action of hydrogen sulfide on a silver(I) solution gives black Ag2S, which is the least soluble in water of all silver compounds (Ksp = 10"50). The black coating often found on silver articles is the sulfide this can be readily reduced by contact with aluminum in dilute sodium carbonate solution. 

This reaction has found little application to mercaptan syntheses since the mercaptans are usually as readily available (by other methods) as the disulfides. The S-S linkage is reduced by zinc in acetic or sulfuric " acid, lithium aluminum hydride, or metallic sodium. y-Hydroxy-propyl disulfide is reduced electrolytically in 70% yield. Reduction by sodium disulfide does not reduce the nitro group in the preparation of p-nitrothiophenol (65%), whereas zinc and acetic acid converts o-nitro-phenyl disulfide to o-aminothiophenol (90%). Disulfides made by the action of ammonium hydrogen sulfide on aldehydes are sources for difficultly available aromatic and heterocyclic mercaptans. The disulfides are reduced by aluminum amalgam and water. ... 

The experimental data allow the following interpretation of the mechanism. By the action of hydrogen sulfide, the sugar formazan (I) is reduced to a sugar hydrazidine derivative (II), which becomes protonized (III) in the course of a slow SnI process, the hydrazidine ion splits off phenylhydrazine, whereafter the arising carbonium ion (IV) unites in a rapid... 

All A-halo compounds can be readily determined by analysis based on their oxidizing action. They liberate two equivalents of iodine from acidified potassium iodide solution almost instantaneously (1 mmole of A-monohalo compound is equivalent to 20 ml of O.In-thiosulfate solution). The liberation of iodine from hydrogen iodide involves production of the amine or amide parent of the halo compound. Sodium sulfite and hydrogen sulfide also reduce N-halo compounds. UV and IR spectroscopic methods have been worked out for determination of JV-halo compounds.399... 

Ferrous hydroxide and ferrous sulfide are formed in the proportion of 3 moles to 1 mole. Analysis of a rust in which sulfate-reducing bacteria were active shows this approximate ratio of oxide to sulfide. Qualitatively, the action of sulfate-reducing bacteria as the cause of corrosion in a water initially free of sulfides can be detected by adding a few drops of hydrochloric acid to the rust and noting the smell of hydrogen sulfide. 

General information. Chemically, THPS is tetrakishydroxymethyl phosphonium sulfate. It is used in oilfield applications, but has also been used in traditional water treatment applieations as well as some non-biocidal applications. A closely related product, THPC (tetrakishydroxymethyl phosphonium chloride) is a widely used flame retardant. THPS is used on both the injection and production side of an oilfield and has a unique mechanism of action which enables it to perform three functions in an oilfield. THPS will kill microorganisms, reduce hydrogen sulfide concentrations and react with and dissolve iron sulfide. 

Cyanuric triazide is reduced by action of hydrogen sulfide to melamine— nitrogen is evolved and sulfur is precipitated [130]. It also decomposes in aqueous sodium hydroxide (0.1M) at 50 °C within several minutes yielding the sodium salt of cyanuric acid and sodium azide [46,52]. The substance is not irritating to the skin [17]. 

In unaerated or anaerobic soils, this attack is attributed to the influence of the sulfate-reducing bacteria (SRB). The mechanism is believed to involve both direct attack of the steel by hydrogen sulfide and cathodic depolarization aided by the presence of bacteria. Even in aerated or aerobic soils, there are sufficiently large variations in aeration that the action of SRB cannot be neglected. For example, within active corrosion pits, the oxygen content becomes exceedingly low. 

An important compound for MIC is hydrogen sulfide. It is produced imder anaerobic conditions by the action of sulfate-reducing bacteria from sulfate, sulfite, and sometimes sulfur [88]. It has also been shown that thiosulfate can by used by SRB... 

Hydrogen sulfide is generally a minor gaseous constituent produced by petrification of organic sulfur compounds, the action of sulfate-reducing bacteria, fossil fuels, combustion and petroleum refining. H2S in a dry atmosphere is only weakly corrosive. It dissociates into and HS , the later being a corrosive species. 

Thioformate synthesis required that the tertiary alcohol 29 was reacted first with / -dimethylaminophenyl isocyanide in the presence of copper oxide to generate an isoamide intermediate (30). This was then converted to thioformate 31 through action of hydrogen sulfide and was subsequently reduced to 32 using standard Barton-McCombie conditions. 

In addition to their concern regarding spray residues of the lead arsenate and organic types, canners whose fruits are sprayed with lime sulfur have reason for concern over the presence of sulfur in their canned products. The presence of elemental sulfur or simple compounds of reduced sulfur in canned foods, especially in those products having an acid character, is objectionable, not only because it may be the source of sulfide flavor and staining, but also because it may actively accelerate the formation of hydrogen by the corrosive action of the product on the container. 

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