Sodium sulfur reduction

In the rings containing sulfur, reduction of sulfoxides of phenoxathiin and thianthrene can be performed in excellent yield with the aluminium chloride/sodium iodide or zinc dust/l,4-dibromobutane systems <1996CHEC-II(6)447>. 

The presence of sulfur is manifested strongly in the stereochemical course of the sodium borohydride reduction of Nuphar thiaspirane hemiaminals. This... 

The tetraphenyl arsonium or phosphonium salts of DSIT-zincate (PPh4)2(ZnC3Ses)2 can be prepared in 13% overall yield by sodium metal reduction of carbondiselenide in organic solvents <90JCS(D)115>. This method is similar to the procedure used for the sulfur analogue. 

Cell operation most simply stated consists of sulfur reduction by sodium, with sodium ions being transported through the solid electrolyte... 

The sulfur-sodium polysulfide system has received the attention of electrochemists but few of the studies have been under conditions comparable to sodium-sulfur battery operating conditions. The thermodynamics of the system have been studied by means of open-circuit potentials (17,27), and dynamic measurements have been made in fused salts (28). The most pertinent studies are those of sulfur-polysulfide electrochemistry in the actual sulfur-polysulfide melts (24, 29, 35). The results of these studies seem to indicate that both the oxidation and reduction reactions are rapid, although the oxidation reaction is hindered by the formation of an insulating sulfur film. These studies also concluded that the electrode reaction sequences were quite complex because of the multitude of polysufide species. As the system becomes better characterized more quantitative descriptions are possible as evidenced by a recent work which modeled the resistive drop through an actual sulfur impregnated graphite electrode in order to correlate the spatial distribu-... 

A number of other reactions confirmed the structural features. On treatment with acetic anhydride in dimethyl sulfoxide, hedrantherine gave a monoacetyl derivative 52 and 53, as a mixture of C-18 epimers. The low [a]D of -294° for this mixture is an interesting phenomenon. With BF3-etherate in methanol at room temperature, the methyl ether 54 was produced. Sodium borohydride reduction of 50 gave a diol (M+ 370) (55) which with acetic anhydride-pyridine gave a diacetate (56). Reaction of hedrantherine with zinc in methanolic sulfuric acid gave a mixture of... 

Uses Polymerization catalyst for synthetic rubber laboratory reagent reagent in reductions waste oil/hydrocarbon refining coolant, heat transfer agent in nuclear reactors mfg. of tetraethyl and tetramethyl lead, sodium peroxide, sodium hydride for photoelectric cells in sodium lamps sodium-sulfur batteries radioactive forms in tracer studies and medicine Manuf./Distrib. Advanced Synthesis Tech. http //www.advancedsynthesis. com, Aldrich http //www.slgma-aldrlch.com, Alfa Aesar http //www.alfa.com. Assoc. Octel Co Ltd http //www. octel-corp. com, Atomergi c... 

R.T. Coutts, D.L. Barton, EA4. Smiyh, Organic sulfur compounds II. Catalyzed sodium borohydride reductions of selected a-(o-nitrophenolthio) adds. Can. J. Chem. 44 (1966) 1733-1741. 

It is easy to reduce anhydrous rare-earth hatides to the metal by reaction of mote electropositive metals such as calcium, lithium, sodium, potassium, and aluminum. Electrolytic reduction is an alternative in the production of the light lanthanide metals, including didymium, a Nd—Pt mixture. The rare-earth metals have a great affinity for oxygen, sulfur, nitrogen, carbon, silicon, boron, phosphoms, and hydrogen at elevated temperature and remove these elements from most other metals. 

Modem chrome-tanning methods are weU controUed and employ an extensive knowledge of the chemistry of the system. The most common chromium-tanning material used is basic chromium sulfate [12336-95-7] Cr(0H)S04, made by the reduction of sodium bichromate with sulfur dioxide or by sulfuric acid and a sugar. 

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