Hydrogen monosulfid

The metallic sulfids are decomposed when heated in air, usually with the formation of sulfur dioxid and the metallic oxid sometimes with the formation of the sulfate and sometimes with the liberation of the metal, and the formation of sulfur dioxid. The strong mineral acids decompose the sulfids with formation of hydrogen monosulfid. 

Benzylacetophenone has been prepared by the reduction of benzalacetophenone with zinc and acetic acid1 and catalytic-ally with palladium and hydrogen 2 by the reduction of /3-duplo-benzylidene acetophenone monosulfide 3 by the oxidation of the corresponding car bind with chromic acid 4 by the hydrolysis of ethyl benzyl benzoylacetate 5 from acetophenone and benzyl chloride by the action of sodamide 6 and from benzoic and hydrocinnamic adds using as catalysts manganese oxide 7 and ferric oxide.8... 

Synonym(s) Hydrosulfuric acid stink damp sulfur hydride sulfurated hydrogen dihydrogen monosulfide dihydrogen sulfide sewer gas HSDB 1998... 

Hydrogen is located on the far left of the periodic table, but it s actually a nonmetal. In keeping with this hydrogenic craziness, hydrogen can appear as either the first or second element in a binary (two-element) molecular compound, as shown by dihydrogen monosulfide (H2S) and phosphorus trihydride (PH3). 

In the final purification, polonium is either dissolved in nitric acid and clectrodeposited onto platinum, or, better, gold (6, 25) the polonium is sublimed in a vacuum from the support metal or dissolved off the latter in dilute hydrochloric acid and precipitated as the monosulfide. Either hydrogen sulfide itself or the sulfide ion produced by the hydrolysis of thioacetamide may be used. The monosulfide is decomposed by heating under vacuum and the pure metal sublimed (14). 

More decisive evidence is provided by the interconvertibility of N-aryl-JV-arylamidinothioureas (28) and Hector s bases by oxidation-reduction.63, B4,67b The former compounds are accessible (as salts) (i) by the condensation of arylthioureas (24) with arylcyanamides (23),63 (ii) by the extrusion of sulfur from the recently described40,41 s-diaryldithioformamidine hydrobromidesB4a (22), (tit) by the oxidation of arylthioureas (24) with 0.5 moles of hydrogen peroxide in the presence of mineral acids,B4a and (iv) by the mild reduction of Hector s bases by hydrogen sulfide in acid media.B4a The first of these four reactions limitB the structure of the products to the three alternatives 25, 28, and 30. Of these, 25 is excluded by the non-identity of the product with authentic67 N-phenyl-i -phenylamidinothiourea (25 R = Ph). The monosulfide structure (30) is not reconciled as readily with the observedB4a hydrolytic fission of the products into diaryl-guanidines (29) and thiocyanic acid as is structure 28. Indeed, as in the case of thioamides and nitriles (see Section II, C, 1), the present condensation may involve the primary formation of an intermediate diimido-monosulfide (30) and its isomerization to 28. 

Formation of Pyrite. Iron is carried to the peat swamp, before seawater transgression, as ferric oxide and hydroxides adsorbed on fluvial clays (123). During early diagenesis in a reducing environment, ferric iron is reduced to ferrous, which reacts with hydrogen sulfide to form iron monosulfide. If the basic mechanism of pyrite formation is similar to that in marine sediments... 

More commonly, but incorrectly, named thiophthalic anhydride and sometimes referred to as phthaloyl monosulfide or o-phthalyl sulfide, this compound (104) may be prepared by heating phthalic anhydride with sodium sulfide125 or by heating phthaloyl chloride with potassium hydrogen sulfide,126 hydrogen sulfide,127 or ethanolic sodium disulfide.128 The reaction between phthaloyl chloride and hydrogen sulfide also gives phthalic anhydride and di-o-phthaloyl disulfide.127 Early attempts to prepare 104 have been described by Chakravarti.126 4-Nitrophthalic thioanhydride may be prepared by hydrolysis of 8 (R = N02 X = C1) (Section III, A).22... 

Bromothiazole (1) reacts with thiourea in alcohol to yield a mixture of dithiazolyl monosulfide (2) and A-4-thiazoline-2-thione (3) (Scheme 1) (4-6). Treatment of 2-bromo-4-methvlthiazole with potassium hydrogen sulfide in alcohol is reported to result in the formation of bis(4-methyl-2-thiazolylisulfide (7). which probably results from the reaction between the initially formed 2-mercaptothiazole and the initial 2-bromo-4-methylthiazole. 

Synonyms Hydrosulfuric acid, sulfuric hydride, sulfurated hydrogen, dihydrogen monosulfide, dihydrogen sulfide, stink damp, sewer gas... 

Cysteic acid is obtained in nearly quantitative yield from cysteine with aqueous hydrogen peroxide in the presence of iron(II) ions.397 Molybdates and tungstates have also been used as effective catalysts for similar transformations.398 An excellent route for the oxidation of 2-thioethanol to isothionic acid has been developed.399 Heteropolyoxometallates supported on alumina400 can also be used to oxidize a range of organo-sulfur compounds. For example, alkyl monosulfides to sulfoxides and sulfones, and thiols to sulfonic acids are a few possibilities (Figure 3.98). 

Butler I. B. and Rickard D. (2000) Framboidal pyrite formation via the oxidation of iron(II) monosulfide by hydrogen sulphide. Geochim. Cosmochim. Acta 64(15), 2665-2672. 

This iron monosulfides is then converted to pyrite (FeS2) (Butler and Rickard, 2000). At Eh below —250 mV and at pH around 6, the conversion of FeS to FeS2 occurs through the oxidation of dissolved FeS by hydrogen sulfide ... 

Studebaker identified the use of lithium aluminium hydride as a chemical probe.Under the right conditions it cleaves poly- and disulfide bonds, leaving the monosulfide intact. Lithium aluminum hydride reacts with polysulfides in an etheral solvent at moderate temperatures and then with a weak acid, the terminal groups are liberated as thiols and interior sulfur atoms are converted to hydrogen sulfide.Lithium... 

We must also consider the relative reactivities of the bonds. In the absence of direct data, we can compare bond dissociation energies as a measure of relative reactivity. Table 11-3 shows some pertinent data collected from various sources [18, 19, 20, 21]. The carbon-sulfur dissociation energies for n-alkyl monosulfides and n-alkyl mercaptans lie within a narrow range. Whether the other sulfur linkage is to carbon, as in n-alkyl monosulfides, or to the hydrogen of a mercaptan has no major influence. There is a small but perceptible trend toward weaker bonding with secondary carbon (isopropyl) and with tertiary carbon (t-butyl) in the unsymmetrical methyl aryl monosulfides, a trend that is not firmly evident in the in the corresponding alkyl mercaptans. The vinyl-sulfur... 

AMMONIUM MONOSULFIDE (12124-99-1) NH4 HS (aqueous) (NH4)2S (anhydrous) The anhydrous material is pyrophoric in air it decomposes at room temperature, releasing ammonia and toxic and flammable hydrogen sulfide gas. Stable below 32°F/0°C. The commercial product [a 40% solution in water (NH4HS)] is stable. The aqueous solution is a reducing agent. Violent reaction with strong oxidizers... 

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