Sulfur dioxide labeled, preparation

The application of the solvent system concept to liquid sulfur dioxide chemistry stimulated the elucidation of reactions such as those of aluminum sulfite. However, there is no direct evidence at all for the formation of S02+ in solutions of thionyl halides. In fact, there is evidence to the contrary. When solutions of thionyl bromide or thionyl chloride are prepared in 3JS-labeled (S ) sulfur dioxide, almost no exchange takes place. The half-life for the exchange is about two years or more. If ionization took place ... 

Sulfur dioxide is produced on a large scale by burning sulfur, Sg. It is also obtained as a by-product of the roasting of sulfide ores (such as FeS2, CuS, ZnS, and PbS). Most of this sulfur dioxide is used to prepare sulfuric acid. Some is used as a bleach for wood pulp and textiles (Figure 22.46) and as a disinfectant and food preservative (for example, in wine and dried fruit). Its use as a food preservative depends on the fact that sulfur dioxide is especially toxic to yeasts, molds, and certain bacteria. Because some people are allergic to sulfur dioxide, foods containing it must be properly labeled. 

Many 0 -labeled inorganic compounds can be prepared by direct reaction with 0 gas in a heated furnace on a vacuum line. By this method, various metal oxides, sulfur dioxide, carbon monoxide, and carbon dioxide have been prepared. 

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