Group hydrogencarbonates

A further peculiarity of the Group I and II carbonates is the ability to form the hydrogencarbonate or bicarbonate ion HCOj ... 

Group II hydrogencarbonates have insufficient thermal stability for them to be isolated as solids. However, in areas where natural deposits of calcium and magnesium carbonates are found a reaction between the carbonate, water and carbon dioxide occurs ... 

Two tandem alkene metathesis-oxidation procedures using Grubb s second-generation ruthenium catalyst resulted in unique functional group transformations. Use of sodium periodate and cerium(III) chloride, in acetonitrile-water, furnished cis-diols. Oxidation with Oxone, in the presence of sodium hydrogencarbonate, yielded a-hydroxy ketones.296 Secondary alcohols are oxidized to ketones by a hydrogen... 

Intramolecular participation of a neighboring hydroxy group is observed in the rearrangement of erythromycin A oxime (24) with p-toluenesulfonyl chloride and sodium hydrogencarbonate in acetone-water (equation 12). Interestingly, with the same reagent in pyridine-ether only the normal rearrangement product (25) is formed. 

The second group of catalysts covers all alkalis and other basic catalysts, including sodium hydroxide and such hydrolyzable salts of weak acids as carbonates, hydrogencarbonates, perchlorates, hypochlorites, and so on. Hypochlorites also act as oxidants. They provide dextrins of excellent clarity and luster in aqueous solution. Ammonia, ammonium compounds, and urea should also be considered. 

The properties of alkali metal salts of most oxoacids depend on the oxoanion present and not on the cation thus we tend to discuss salts of oxoacids under the appropriate acid. However, we single out the carbonates and hydrogencarbonates because of their importance. Whereas Li2C03 is sparingly soluble in water, the remaining carbonates of the group 1 metals are very soluble. 

Those mycotoxins, such as ochratoxin A, which contain a carboxyl group, can be readily extracted into an organic solvent such as chloroform after acidifying the commodity to ensure that it exists entirely in the undissociated form. Aqueous phosphoric acid (0.1 mol 1 ) is frequently used. Ochratoxin A can then be back-extracted from the chloroform using sodium hydrogencarbonate solution or trapped on a column of diatomaceous earth... 

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