Tetraborate treatment

The MejSi protecting groups in 58 a and 59 a could be removed by treatment with sodium tetraborate (borax) in MeOH/THF, yielding 58c and 59 c, respectively, as very unstable compounds [84]. Any attempts to obtain characterizable two-dimensional all-carbon network structures [3,4] by oxidative polymerization of 59 c have failed. 

Coumarins are pharmacologically active and have been used in the treatment of a diverse range of diseases. The great diversity of coumarin structures and their wide range of polarities present special problems for their simultaneous analysis. The separation of seven closely related coumarins by CZE was studied. Optimized conditions tallied with a 200 mM boric acid—50 mM tetraborate buffer pH 8.5 and were applied to the determination of coumarins in extracts from roots and aerial parts from the plant Chrysanthemum segetum. Baseline separation of six coumarins was achieved in 10 min. 

A blank solution is made by first fusing 175 mg of lithium tetraborate in a rhodium-platinum crucible further treatment is the same as that described for the samples. 

Early studies involved treatment of wood specimens with fire-retardant chemicals, then subjecting the treated specimens to thermal analysis by TG. Browne and Tang (41) tested eight compounds, some of which were known to be effective fire retardants, and some of which were not. The TG results (Figures 8-10) indicate that all compounds increased the residual char weight of the material. Except for sodium tetraborate, the more effective the salt as a flame retardant the lower the temperature of active pyrolysis and the greater the amount of char. These results were confirmed through repeated experiments (45, 46). 

Sodium silicoaluminate Sodium tetraborate pentahydrate Tetrasodium iminodisuccinate Tetrasodium pyrophosphate . Zeolite synthetic softener, water treatment Calcium hydroxide Calcium oxide ... 

In the mid-1950s, naphthalene flakes were introduced. Naphthalene is oil soluble and sublimes at about 175°F, making it applicable to oil wells and gas wells of moderate temperature. Around the same time, other diverters were introduced. These included crushed limestone (for HCl treatments only), oyster shells, sodium tetraborate, perlite, gilsonite, paraformaldehyde, and chicken feed. Success was mixed with all of these. 

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