Sulfane dioxide

Q.31) (Q.31) Sulfur dioxide, sulfane dioxide, sulfurous anhydride, sulfur oxide [7446-09-5] FEMA 3089... 

Spiro(37/-2,l-benzoxathiol-3-one)-l,l -37/-2-methyl-l,3,2-benzodithiazole 3,3-dioxide 179 is readily available from sulfoxide 178 under mild reaction conditions, and optimal 86% yield of spiro-A4-sulfane 179 was achieved after 10-15 min at room temperature. Harsher reaction conditions, that is, 3h at reflux, lead to ring-enlargement product, dibenzodithiazocine 180, in 89% yield (Scheme 48 <1995CC1069>). 

Triphenylphosphane is an oxophilic compound that reduces sulfoxides (R2SO), disulfane oxides (RS(O)SR), disulfane dioxides (sulfones) (RSO2SR), and trisulfane tetroxides to the corresponding sulfanes. From the products prepared by equations (62) or (63), symmetrical or unsymmetrical aryl- or alkyltrisulfanes can be obtained in high yields (refluxing in ether or benzene) (equation 64). ... 

Sulfane oxides are compounds of type R2S Om ( > 1, m = 1, 2, 3...) with the oxygen atoms present as sulfoxide or sulfone groups. For the nomenclature of organic sulfur-oxygen compounds see Table 2 for reviews on oxidized sulfur chains and rings, see Steudel. Disulfane 1-oxides, RS(0)-SR, are also known as thiosulfinates and the 1,1-dioxides are usually termed as thiosulfonates. Trisulfane 1-oxides and 1,3-dioxides, as well as tetrasulfane 1-oxides and 1,4-dioxides, have been obtained by stepwise oxidation of the corresponding sulfanes by peroxy acids (equations 151 153) 67,101,123,127,262 26s... 

Thietan 4-Brom-2,2-dimethyl-3-dimethylamino- -1,1-dioxid Ell, 1559 (En + Sulfan)... 

Acesulfame-K is the potassium salt of 6-methyl-1,2,3-oxathiazin-4(3H)-one-2,2-dioxide. This sweetener was discovered in Germany and was first approved by the FDA in 1988 for use as a nonnutritive sweetener. The complex chemical name of this substance led to the creation of the trademark common name, acesulfame-K, which is based on its following relationships to acetocetic acid and sulfanic acid, and to its potassium salt nature [9] ... 

Dimethy Ipropyny l-sulfonium bromide Sulfoxides, Dimethyl sulfoxide Thiirane 1-oxide Tosy Imethylisocyanide Dialkoxysulfuranes Me,N-S-NMe, (Bisdimethylamino-sulfane) Thioacetamide Benzothiazole-2-thione, 3-methyl-Thiazolium salts - bromide, N-lauryl-Et,NCSSH Thiourea, Thioureas 1 -A cety l-2-thiourea Thiourea dioxide Selenourea Thiocyanates ArN C S (NCS),... 

Bisdimethylamino-sulfane) Thioacetamide Thiourea, Thioureas 1 -A cetyl-2-thiourea Thiourea dioxide Selenourea Thiocyanates ArN C S (NCS),... 

Among the most important volatile sulfur compounds are hydrogen sulfide (sulfan), various thiols, sulfides, isothiocyanates and heterocyclic sulfur compounds. Precursors of volatile sulfur compounds are usually non-volatile, sensory indifferent sulfur compounds, especially sulfur-containing amino acids cysteine, cystine, methionine and their derivatives, such as S-alk(en)yl cysteine sulfoxides, glucosinolates, thiamine and other compounds. An important sulfur compound is also sulfur dioxide, which is used as a preservative and an inhibitor of enzymatic browning reactions or the Maillard reaction. It also occurs in a small amount as a metabolite in fermentation processes. Sulfur compounds may be accompanied by their selenium analogues at very low concentrations. 

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