Sulfides reagents

Whilst many solvating ligands have been studied, the dialkyl sulfide reagents (see Table 6) remain the most important commercially 297... 

It is recommended to add sodium sulfide reagent solution to the test and control solutions at the same time and to observe them approximately 5 min later. After that time, sulfur will precipitate causing turbidity. 

C. Ammonium Sulfide Reagent is prepd by mixing 1 volume of (NH4)2S with I vol of alcohol... 

Mo04] with H2S or sulfiding reagents in basic solutions. These salts are interesting because of their roles in Cu-Mo antagonism in ruminants, and their potential as treatments for Wilson s disease. Several alkylammonium salts of [MoS4] have been reported, which has facilitated the study of the nonaqueous chemistry of this dianion. 

Selective conversiou of allylic and benzylic alcohols into halides It was noted above that allylic or benzylic alcohols are not oxidized by the N-chlorosuccinimide-dimethyl sulfide reagent but instead are converted into chlorides. Corey et al. now report that this procedure can be used to form allylic and benzylic chlorides in high yield if the sulfoxonium intermediate corresponding to (3, above) is allowed to decompose in methylene chloride without addition of a tertiary amine. For example, the allylic or benzylic alcohol is treated with the complex of N-chlorosuccinimide-dimethyl sulfide as above in methylene chloride and then allowed to stand for 4 hr. at - 25°. In the case of benzhydroi [(CfcH5)2CHOH], benzhydryl chloride can be obtained in > 95% yield. 

The t-butyl sulfide reagent provides access to tetramers difficult to prepare by other methods. The order of reactivity in this replacement correlates with the acidity of the RSH reagent aryl sulfides replace alkyl sulfides, which have reactivity order p-XC6H4SH, X = NO2, Me, H, NMc2, [NMc3] PhCHjSH HOCH2CH2SH EtSH. The synthetic analogues of iron-sulfur proteins are described. ... 

Use Base for production of methylene blue, photodeveloper, reagent for detection of hydrogen sulfide, reagent for cellulose, organic synthesis, reagent for certain bacteria. 

Sulffde Precipitants. The removal of heavy metals from waste waters using soluble sulfides has been studied extensively. Peters and Ku (13) showed that pH strongly affects the removal of heavy metal sulfides from waste water. Their data showed that the solubilities of most heavy metal sulfides, other than arsenic (HI) sulfide, decreases up to about pH 9. Since most phosphate fluid fertilizers, such as 10-34-0 and 11-37-0, have a pH in the range of 6 to 7, these data indicate that concentrations of several heavy metals in phosphate fluid fertilizers could be reduced to very low levels by precipitation with inorganic sulfide reagents. The use of soluble sulfides to precipitate heavy metals from WPA has also been reported. Both Maruyama (14) and Berglund (15) have... 

Two additional allylic sulfide reagents bearing substituents at C-2 are the bromo substituted compound 94 and the acetoxymethyl compound 95 (Fig. 4). The 2-... 

Effkemann, S., Brodsgaard, S., Mortensen, P., Linde, S. A., and Karst, U., Determination of gas phase peroxyacetic acid using precolumn derivatization with organic sulfide reagents and liquid chromatography, J. Chromatogr. A, 855, 551-561, 1999. 

Particularly useful in cyclic dialkyne chemistry is sulfide as a nucleophile. This is due to a discovery made by Regen and co-workers, who found that the yield of dialkyl sulfides is strongly enhanced when the sulfide reagent is first adsorbed onto AI2O3 thus, the substitution reaction takes place on the surface of the aluminum oxide. As the preparation of cyclic sulfides from dibromides is a stepwise process, these conditions were expected to increase the yield of cyclic sulfides dramatically as one end of the chain is immobilized after displacement of the first bromine [14]. Nicolaou first used this principle in the preparation of a series of cyclic thiadiynes [Eq. (6)] [15]. The cyclic thiadiynes prepared in this way are very useful as they can be converted to cyclic enediyne systems via the Ramberg-Backlund ring-contraction reaction (see below). 

Effkemann et al. (1999) have developed a similar precolumn derivatization method using organic sulfide reagents and liquid chromatography. The derivatizing reagent is... 

Several higher members of this class, including the NCS-diisopropyl sulfide reagent, are reported to show unusual selectivity for primary and secondary alcohols. Thus at 0 °C the reagent... 

The NCS-dialkyl sulfide reagents are thermally labile, and depending on structure undergo a variety of transformations leading ultimately to a-chlorination of the sulfide (eq 10). ... 

Reduced chalcogens. Sulfane, H2S, gradually and incompletely precipitates black cobalt(II) sulfide, CoS , from solutions of Co from acetate solution the separation is fairly prompt and complete, but in the presence of strong acids, no precipitate forms. If, however, the cobalt is in NH3 solution, the reaction is rapid and complete. Alkali sulfides immediately and completely precipitate CoS , which is insoluble in excess of the reagent. At first the precipitate is distinctly soluble in dilute HCl, but upon standing 10 to 15 minutes, quite insoluble. The simple formula CoS represents the Co(OH)j (SH)2.j produced free of air. Air rapidly forms Co(OH)S, still acid-soluble, which, with more sulfide reagent, becomes a less soluble Co sulfide. 

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