ChemicalBook CAS DataBase List Sulfur dioxide

Sulfur dioxide synthesis

11synthesis methods

Product Name:Sulfur dioxide
CAS Number:7446-09-5
Molecular formula:O2S
Molecular Weight:64.06

Sulfur dioxide usually is prepared industrially by the burning in air or oxygen of sulfur or such compounds of sulfur as iron pyrite or copper pyrite. Large quantities of sulfur dioxide are formed in the combustion of sulfur-containing fuels. In the laboratory, the gas may be prepared by reducing sulfuric acid (H2SO4) to sulfurous acid (H2SO3), which decomposes into water and sulfur dioxide, or by treating sulfites (salts of sulfurous acid) with strong acids, such as hydrochloric acid, again forming sulfurous acid.

773837-37-9 Synthesis

773837-37-9
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67641-28-5 Synthesis

67641-28-5
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$45.00/50mg

Sulfate(1-), difluorodioxo-, (T-4)- (9CI)

12769-73-2
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116-15-4 Synthesis

116-15-4
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558-25-8
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$20.60/5g

7792-66-7
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667-49-2
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7446-09-5
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$195.00/25ML

Yield:7792-66-7 27%

Reaction Conditions:

in acetonitrile at -10 - 4.4; for 4.5 h;Inert atmosphere;Temperature;

Steps:

4.2.1. Method A

A 500-mL three-necked round-bottom flask, equipped with a magnetic stirrbar, reflux condenser, a dropping funnel, thermometer, and a bubble counter was charged with NaCN (42.5?g, 0.87?mol) suspended in MeCN (211?g, 245?mL) in the atmosphere of dry nitrogen. The suspension was cooled to -10?°C and PFAFS 1 (100.3?g, 0.44?mol) was slowly added within 2.5?h. At the same time, a strong exothermic was observed and the temperature raised up to 4.4?°C. In this case the addition of 1 immediately ceased and the temperature of the reaction mixture decreased again to -10?°C. After addition of 1, the reaction mixture was stirred for 2?h at -10?°C and afterwards it was distilled under reduced pressure. The following fractions were collected: fraction 1 (19.9?g,??50?°C/293?mmHg). Then, the fraction 1 was additionally distilled with a short Vigreux column. The fraction with b.p. 26-27?°C/760?mmHg was collected. 2 was obtained in 27% yield (18.6?g) as a colorless liquid.

References:

Tverdomed, Sergey N.;Hirschberg, Markus E.;Pajkert, Romana;Hintzer, Klaus;R?schenthaler, Gerd-Volker [Journal of Fluorine Chemistry,2018,vol. 210,p. 65 - 69]