Powder sodium

Lead oxide reacts violently with numerous metals such as sodium powder (immediate ignition), aluminium (thermite reaction, which is often explosive), zirconium (detonation), titanium, some metalloids, boron (incandescence by heating), boron-silicon or boron-aluminium mixtures (detonation in the last two cases). Finally, silicon gives rise to a violent reaction unless it is combined with aluminium (violent detonation). It also catalyses the explosive decomposition of hydrogen peroxide. 

Tropinone. 10 g of pyrrolidinediethyl diacetate are heated with 10 g of cymene and 2 g of sodium powder, the reaction taking place at about 160°. During the reaction (which is complete in about 10 min) the temp should not exceed 172°. The resulting reaction product is dissolved in water, then saturated with potassium carbonate, and the oil, which separates, is boiled with dilute sulfuric acid. 2.9 g of tropinone picrate forms and is filtered. 

The ACS Style Guide (8) Klinger, J. Influence of Pretreatment on Sodium Powder. Chem. Mater. 2003, 17, 2755-2768. 

The use of sodium powdered under xylene allows the reaction to be carried out much more rapidly than is the case if the sodium is cut into small pieces with a knife. Toluene may be used in place of xylene. The sodium should be as free as possible from oxide. 

Caution. Carbenoxolone sodium powder is irritating to nasal membranes. Dissociation Constant. pKa 6.7,7.1. 

Addition of LiOFI H2O (or Na2C03) solntion to the niobium peroxo solution prodnces a clear colorless solntion with lots of effervescence. The solution remains clear when it is allowed to stand at room temperature for several hours. However, when the solntion is warmed on a water bath at 80 to 90°C for 10 min, the reaction becomes exothermic with further evolution of gas. After a few seconds, some white compound precipitates out. The FT IR for this compound is shown in Fignre 6.6b. The infrared (IR) features obtained for the white powder were completely different from those of the peroxide precursor, with a broad band being observed between 7(X) cm and 400 cm in the case of lithium salt (Figure 6.6b) and a wide band at 540 cm with a shoulder at 770 cm in the case of sodium, with additional bands at about 3400 cm and 1600 cm due to coordinated water. The FTIR spectra for the lithium and sodium powders heated at 400°C showed IR features that are characteristic of LiNbOj and NaNbOj. Thus... 

Dibiphenylene-diphenyl-ethane and sodium powder are shaken together Schlenk and Mark, jBer., 1922, 55, [B], 2285, 2299. 

Sodium powder is prepared by melting S g of carefully cleaned cut sodium metal in 250 mL of boiling xylenes. After removal of the heating bath a slow stream of nitrogen is passed over the solvent, and a high speed stirrer (20,000 rpm, e.g., Ultra-Turrax, model T 18/10) is introduced and run for 15 s. The finely divided metal is filtered and washed (three l5-mL portions of pentane) under inert gas and sucked dry. It can be stored in a dry box for months without loss of activity. ... 

The checker prepared sodium powder by washing Na dispersion in light oil (Aldrich 21, 712-3) with hexane until the oil had been removed. 

Aroylcyclopropanecarboxylates 13 were obtained by reaction of ethyl cyanoacetate with a.,p-unsaturated carbonyl compounds in the presence of sodium powder. Even relatively crowded chalcones were converted into the corresponding 2-aroylcyclopropanecarboxylates in high yields. 2-Aroylcyclopropanecarboxylates have also been synthesized using other cyclopropan-ating agents. ... 

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