Nitrogen monochloride

Chlor-siure, /. chloric acid. -sMureanhydrid, n. chloric anhydride, chlorine(V) oxide, -schwefel, n. sulfur chloride (esp. the monochloride). -silber, n. silver chloride, -sili-cium, n. silicon tetrachloride, -soda, /. = Chlornatron. -stickstoff, m. nitrogen chloride. -Strom, m. stream of chlorine, -strontium, n. strontium chloride, -suifonsaure, /. chlorosulfonic acid, chlorosulfuric acid, -toluol, n. chlorotoluene. -fibertrager, m. chlorine carrier. 

Hawthorne et al. [53] compared supercritical monochloride-fluoromethane, nitrogen dioxide and carbon dioxide for the extraction of polychlorobiphenyl from sediments. Monochlorodifluoro methane provided the highest recovery. Methanol modified carbon dioxide provided a 90% recovery of polychlorobiphenyls from sediments. 

The final chapter in this volume covers the use of sulfur monochloride in the synthesis of heterocyclic compounds and is by O.A. Rakitin and L.S. Konstantinova (Zelinsky Institute, Moscow, Russia). It includes a survey of the extensive work carried out by these authors and other friends and associates of the late Charles Rees on heterocycles containing heterocycles with up to five sulfur atoms and often many nitrogen atoms. In addition, the chapter also shows how sulfur monochloride may be used advantageously in the synthesis of other sulfur heterocycles. 

Hexasulphamide, S6NH2.—In the preparation of nitrogen sulphide, N4S4, from ammonia and sulphur monochloride, as already described (p. 283), the mother-liquor may, on concentration, yield hexasulphamide in addition to nitrogen pentasulphide. Hexasulphamide crystallises in colourless, square plates, melting at 105° C. It is insoluble in water... 

Compounds which contain sulfur-nitrogen rings were known in the last century, but many new ones have been prepared in the last decade. It is currently an area of considerable interest. The ammonolysis of sulfur monochloride. S CIj, either in solution in an inert solvent or healed over solid ammonium chloride, yields letrasuffiir tetranitride ... 

In the case of diethyl chlorophosphate 1-ethylindole, the formation of which agrees with data on the alkylating ability of the derivatives of the phosphorus acids, was isolated [114]. In the transition to the dichlorides of P(IV) acids, where the electrophilicity of the phosphorus atom is increased in comparison with the monochlorides, the reaction takes place under milder conditions (at about 0°C) and is accompanied by an insignificant exothermic effect. In the reaction products (121) the phosphorus atom is bonded to the nitrogen atom of indole ... 

A 20% solution of sodium / -nitrophenolate (p-NphNa) from collector 7 (see the previous diagram) is pressed by compressed nitrogen into reactor 1. Reactor 1 is also loaded with OP-7 catalyst out of batch box 3. The contents of the reactor are heated with water sent into coil 2. After that the hot water is switched off and the coil is filled with cold water to withdraw the heat of the reaction. Reactor 1 receives ethyl monochloride from batch box 4. 1 hour after ethyl monochloride begins to flow out of batch box 5 into reactor 1, it is supplemented with an 18% soda solution to support the neutral medium in the reactor. The synthesis takes 5 hours. The end of the reaction is determined by the analysis of thiophene by the refraction index (nD20 = 1.47-1.50). 

Preparation of methyl monochloride. Methyl monochloride is synthesised in reactor 10 (see Fig. 110), which is made of stainless steel and has a propeller agitator, a jacket and a coil. Methyl dichloride is sent from batch box 9 by compressed nitrogen into reactor 10 and is cooled there to 0 °C by sending -15 °C salt solution into the coil and the jacket of the apparatus. Then, reactor 10 is filled at agitation with a necessary amount of methyl alcohol from batch box 11. After mixing dichloride and methyl alcohol, the temperature in reactor 10 is brought to 0 °C at this temperature and agitation the apparatus receives metered amounts of 40-42% solution of sodium hydroxide from batch box 12. 

Ideally one would like to compare complexes where X, Y, and Z all remain constant. There are quite a number of rate constants available for the hydrolysis of the dichlorides (X = Y = Cl, Z = HjO) and these serve to link together many of the simpler chelating ligands with nitrogen donor atoms. There are a few comparable rate constants for monochlorides. These are all listed in Table XIV. 

Other miscellaneous additions have been reported. Novel three-, five-, and six-membered nitrogen-sulphur heterocycles have been prepared by irradiation of sulphur monochloride in the presence of perfluoroazoalkanes. Photoaddition of hydrogen sulphide to the diallylsilane (232) yields the thiol (233), which readily undergoes cyclization to the l-thia-5-silacyclooctane (234). ... 

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