Sodium hydroxide, dry

Figure 2.6 Pasteur in his laboratory. Dr. Pasteur is examining a specimen of spinal cord from a rabid animal. The material at the bottom of the jar is sodium hydroxide (drying agent).

The p-toluenesulfonyl chloride should be free of j-toluenesulfonic acid, otherwise potassium p-toluenesulfonate will be formed and will result in the formation of tosylates, rather than thiotosylates. The reagent used by the checkers was obtained from British Drug Houses Ltd. and was purified according to the following procedure.4 A benzene solution of the tosyl chloride was washed with 5% aqueous sodium hydroxide, dried with magnesium sulfate, and then distilled under reduced pressure, b.p. 146° (15 mm.). 

Another Zinc Reduction. Prepare or activate the zinc as follows 400 g of mossy zinc is treated with 800 ml of 5% aqueous solution of mercuric chloride for 1 hour. Decant the solution off and use the zinc right away. Add. 834 mole of compound to be reduced to the zinc amalgam, followed by as much HCl acid (.834 mole) diluted in as much water as is required to cover all the zinc. Reflux for 6 hours while adding small portions of dilute HCL acid. Cool, separate the upper, wash free of acid (a few portions of dilute sodium hydroxide), dry and distill to get about a 79% yield of product. 

Finally, the polyamide oxidative fluorescence is unmistakably quenched when the fluorescing plate is treated with sodium meth-oxide or IN sodium hydroxide, dried, and viewed under long-wave UV light, a test developed by Malshet, et al. (27). Methanol or water alone has no effect. Strong acid restores the fluorescence. We were not able to quantitate this quenching and restoration, because of the risk of damage to the solid sample holder. 

Technical />-toluenesulfochloride is dissolved in benzene, washed with 5 per cent sodium hydroxide, dried by shaking with a small amount of potassium carbonate, and then distilled in a vacuum. If the vacuum distillation must be interrupted, it is recommended that the liquid be allowed to cool before breaking the vacuum otherwise, when distillation is resumed later, considerable decomposition takes place. 

Cover 0.5 g of cholesterol with 5 mL of acetic acid in a small Erlenmeyer flask, swirl, and note that the initially thin slurry soon sets to a stiff paste of the molecular compound C27H45OH CH3CO2H. Add 1 mL of acetic anhydride and heat the mixture on the steam bath for any convenient period of time from 15 min to 1 h record the actual heating period. While the reaction takes place, prepare the chromatographic column. Cool, add 20 mL of water, and extract with two 25-mL portions of ether. Wash the combined ethereal extracts twice with 15-mL portions of water and once with 25 mL of 10% sodium hydroxide, dry by shaking the ether extracts with 25 mL of saturated sodium chloride solution, then dry the ether over anhydrous sodium sulfate for 10 min in an Erlenmeyer flask, filter, and evaporate the ether. Save a few crystals of this material for TLC (thin-layer chromatography) analysis. Dissolve the residue in 3-4 mL of ether, transfer the solution with a capillary dropping tube onto a column of 12.5 g of silica gel, and rinse the flask with another small portion of ether. ... 

CAUSTIC SODA, GRANULAR CAUSTIC SODA, LIQUID CAUSTIC SODA, SOLID CAUSTIC SODA, SOLUTION LEWIS-RED DEVIL LYE LYE SODALYE SODIUM HYDRATE SODIUM HYDROXIDE, BEAD SODIUM HYDROXIDE, DRY SODIUM HYDROXIDE, FLAKE SODIUM HYDROXIDE, GRANULAR SODIUM HYDROXIDE, SOLID WHITE CAUSTIC... 

The steps of methylation are as follows. 10 mg of HP- -CD is taken into a test tube with stopper, add 3 mL dimethylsulfoxide and mix the solution. Add 50 mg sodium hydroxide dry powder and 0.5 mL iodomethane, and then fill with nitrogen. Treat with ultrasonic at room temperature for 60 min. Add 5 mL water to suspend the reaction. Extract by 3 mL chloroform. Wash the organic phase twice with 5 mL water, then distill imder reduced pressure to get faint yellow methylated product. Hydrolyze the product in 2 mol/L trifluoroacetic acid at 120 C for 1 h. 

Kieselguhr G (Merck) buffered to pH 5.3. Prepare slurry with a mixture of 100 ml 0.05 M potassium hydrogen phthalate and 32 ml 0.1 Af sodium hydroxide. Dry the plates 1 h at 105°C Solvent... 

Sodium Bisulfite Solution 2693 60 Sodium Hydroxide, dry, solid 1823 60... 

SODIUM HYDROXIDE, dry solid 1845 21 CARBON DIOXIDE, solid... 

Extract 2 g of sample for five hours in a Soxhlet thimble with 95 per cent ethanol containing about 0 1 g of sodium hydroxide. Dry the insoluble matter and weigh. To this weight add the water content of the drug determined by toluene distillation. The alcohol-soluble extract is calculated by difference. 

To a flask containing 188 gm (2.0 moles) of phenol are added 242 gm (2.0 moles) of allyl bromide, 280 gm (2.0 moles) of anhydrous potassium carbonate, and 300 gm of acetone. The mixture is refluxed on the steam bath for 8 hr, cooled, diluted with an equal volume of water, and extracted with ether. The ether extract is washed twice with 10% aqueous sodium hydroxide, dried, the solvent stripped off, and the residue distilled under reduced pressure to yield 230 gm (86%) of allyl phenyl ether, bp 85°C (19 mm). 

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