Sodium hydrogen sulfide, anhydrous

The process implications of equation 3 go beyond the weU-known properties (27—29) of NMP to faciUtate S Ar processes. The function of the aminocarboxylate is also to help solubilize the sulfur source anhydrous sodium sulfide and anhydrous sodium hydrogen sulfide are virtually insoluble in NMP (26). It also provides a necessary proton acceptor to convert thiophenol intermediates into more nucleophilic thiophenoxides. A block diagram for the Phillips low molecular weight linear PPS process is shown in Eigure 1. 

Sodium hydrogen sulfide, NaSH, 9,429. Anhydrous reagent is prepared by reaction of sodium ethoxide and hydrogen sulfide in ethanol. The yield is essentially quantitative.1... 

Although it is known that a chlorine atom at the 4-(or 5-)position is more reactive than at the 3- or 6-position for nucleophilic substitution, 3-acetamido-(or amino-)5-chloro-6-methoxypyridazine is resistant to hot aqueous sodium hydroxide and 30% sodium hydrogen sulfide solution, but susceptible to solvolysis in acetic acid containing anhydrous potassium acetate to yield the 5-hydroxy derivative. 

Sodium carbonate, anhydrous 3393 Sodium hydrogen sulfide 3384... 

Hydrogen sulfide, dried over phosphorus(V) oxide, is then passed through the stirred solution, at a rate of five to ten bubbles per second, for two hours. As the resulting solution cools, some sodium hydrogen sulfide is deposited. When the solution has cooled to room temperature, 750 ml. of anhydrous ethyl ether is added as rapidly as possible to precipitate completely the sodium hydrogen sulfide. 

The following operations are performed as rapidly as possible to prevent the absorption of water by the sodium hydrogen sulfide. The precipitate is quickly separated from the ether-ethanol solution by vacuum filtration on a coarse fritted-glass filtering funnel and is washed three times with anhydrous ethyl ether. After the last washing, nearly all of the ether is allowed to evaporate and the product is rapidly transferred to a container which is then placed in a vacuum desiccator over calcium chloride. The desiccator is connected to a vacuum line for several hours to free the product of residual ethyl ether. 

Anhydrous gaseous or Hquid hydrogen sulfide is practically nonacidic, but aqueous solutions are weakly acid. The for the first hydrogen is 9.1 X 10 at 18°C for the second, is 1.2 x 10 . Reaction of hydrogen sulfide with one molar equivalent of sodium hydroxide gives sodium hydrosulfide with two molar equivalents of sodium hydroxide, sodium sulfide forms. Hydrogen sulfide reacts with sodium carbonate to produce sodium hydrosulfide... 

In a copper or iron kettle of 4-I. capacity is placed a solution of 200 g. of d-tartaric acid and 700 g. of sodium hydroxide in 1400 cc. of water. A 12-I. flask through which cold water is run is placed in the mouth of the kettle in order to prevent loss of water vapor, and the mixture is boiled gently over an open flame for four hours. The solution is now transferred to a 12-I. flask or crock and partially neutralized with 1400 cc. of commercial hydrochloric acid (density 1.19). To the still alkaline solution is now added just enough sodium sulfide to precipitate all the iron or copper which has been dissolved from the kettle (Note i). The filtered solution is then just acidified with hydrochloric acid, boiled to expel all hydrogen sulfide, and made very faintly alkaline to phenolphthalein with sodium hydroxide solution. To the hot solution is then added a concentrated solution of 300 g. of anhydrous calcium chloride which causes an immediate precipitation of calcium tff-tartrate and mesotartrate. 

Both anhydrous and hydrated sodium or potassium sulfide in ethanol have been used in the synthesis of thietanes. A common procedure is to use a solution of sodium or potassium hydroxide saturated with hydrogen sulfide. Liquid ammonia has been used as a solvent for the preparation of thietane (32%) from sodium sulfide and 1,3-dibromopropane. Phase-transfer catalysis has been used to good effect.A variation in which l,3-dichloro-3-methylbutane 3 is treated with aluminium chloride and hydrogen sulfide followed by aqueous sodium hydroxide gave 2,2-dimethylthietane 4 in 90% yield. An intermediate aluminium chloride-alkene complex, 5 or 6, was proposed. 

Anhydrous sodium monothiophosphate is a white, crystalline solid which decomposes without melting at 120 to 125° to release a volatile compound that discolors lead acetate paper. The anhydrous salt does not absorb moisture from the air at relative humidities below 31%. The solid 12-hydrate evolves hydrogen sulfide slowly at room temperature and decomposes rapidly at 60°. Solubilities in grams of anhydrous salt per liter of saturated solution at various temperatures are 4°, 21.2 18°, 79.2 28°, 132.7 38°, 241.5. Solutions of the sodium salt decompose only very slowly when stabilized with added... 

COPPER (7440-50-8) Cu The powder forms the friction-, heat-, or shock-sensitive explosive detonator, copper acetylide, with acetylene gas acetylenic compounds and ethylene oxides. The powder forms explosive materials with azides (e.g., sodium azide forms potentially explosive copper azide). Finely divided material forms friction-, heat-, or shock-sensitive explosive with powdered divided bromates, chlorates, and iodates of barimn, calcimn, magnesium, potassium, sodium, or zinc. Violent reaction, possibly explosive, when finely dispersed powder comes in contact with strong oxidizers ammonium nitrate alkynes, bromine vapor, calcium carbide, chlorine, ethylene oxide, hydrazine mononitrate, hydrogen peroxide, hydrogen sulfide, finely divided bromates, iodine, lead azide, potassium peroxide, sodium peroxide (incandescence), sulfuric acid. Incompatible with acids, anhydrous ammonia chemically active metals such as potassium, sodium, magnesium, and zinc, zirconium, strong bases. 

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