Promoting agent potassium carbonate

For diets where the intake of sodium chloride is restricted, salt substitutes for use in cooking or as table salt are available and contain mainly potassium chloride, e.g. LoSalt (Klinge Chemicals Ltd) is a blend of 2/3 potassium chloride and 1/3 sodium chloride with magnesium carbonate added as a flow-promoting agent. A specification for potassium chloride is contained in the Food Chemicals Codex (FCC). 

If tin and sulfur are heated, a vigorous reaction takes place with the formation of tin sulfides. At 100—400°C, hydrogen sulfide reacts with tin, forming stannous sulfide however, at ordinary temperatures no reaction occurs. Stannous sulfide also forms from the reaction of tin with an aqueous solution of sulfur dioxide. Molten tin reacts with phosphoms, forming a phosphide. Aqueous solutions of the hydroxides and carbonates of sodium and potassium, especially when warm, attack tin. Stannates are produced by the action of strong sodium hydroxide and potassium hydroxide solutions on tin. Oxidizing agents, eg, sodium or potassium nitrate or nitrite, are used to prevent the formation of stannites and to promote the reactions. 

Chiral 2-oxazolidinones are an important class of heterocycles. These compounds are known for their synthetic utility as chiral auxiliaries and their pharmacological properties, specifically as antimicrobial agents. One of the most synthetically appealing methods for the synthesis of these compounds is the annulation of an acyclic precursor. In 2007, Gabriele and co-workers reported the synthesis of the 2-oxazolidinones 168 from a,a-disubstituted 2-ynylamines 167 using an unprecedented Pd-catalyzed water-promoted sequential oxidative aminocarbonylation-cyclocarbonylation process with secondary amines in the presence of carbon monoxide, oxygen, water, and potassium iodide (KI) (Scheme 78) (140). 

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