Disulfides disodium

Dithiobis (1-propanesulfonic acid), disodium salt. See Bis-(3-sulfopropyl)-disulfide, disodium salt 2,2 -Dithiobis (pyridine-1-oxide). See Bispyrithione... 

Di (thiopropane sodium sulfonate). See Bis-(3-sulfopropyO-disulfide, disodium salt... 

Bis-(3-sulfopropyl)-disulfide, disodium salt Sulfopropyl methacrylate, K salt 3-Sulfopropyl methacrylate, potassium salt. See Potassium sulfopropyl methacrylate N-(3-Sulfopropyl)-N-methacryloyloxyethyl-N,N-dimethyl ammonium betaine. See N,N-Dimethyl-n-methacryloxyethyl-n-(3-sulfopropyl)-ammonium betaine 1-(3-Sulfopropyl) pyridinium betain N-3-Sulfopropylpyridinium betaine 1-(3-Sulfopropyl) pyridinium hydroxide, inner salt. See Pyridinium propyl sulfobetaine 1-(3-Sulfoprop-1-yl)-2-vinylpyridinium betaine. See 1-(3-Sulfopropyl)-2-vinyl-pyridinium-betaine... 

Bromine and bromides can be detected quaUtatively by a number of methods. In higher concentrations bromine forms colored solutions in solvents such as carbon tetrachloride [56-23-5] and carbon disulfide [75-15-0]. Bromine reacts with yeUow disodium fluorescein [518-47-8] to form red disodium tetrabromofluorescein (eosin) [548-26-5] C2QH Br4Na20. As Httle as 0.3 p.g of bromide can be detected and chlorides do not interfere (56). Bromine reacts with platinum sulfate [7446-29-9] Pt(S0 2> solution to form red to brown crystals of potassium hexabromoplatinate [16920-93-7] K PtBr ( )-... 

Thiophenols cannot be obtained by an analogous reaction because, once some thiophenol is formed, it catalyzes the homolytic dediazoniation. Thiophenols can, however, be synthesized by other reactions starting with an arenediazonium ion. If disodium disulfide (Na2S2) and NaOH are added to a solution of a diazonium salt, the corresponding diaryldisulfide (Ar - S - S - Ar) is formed. After isolation the lat-... 

Dioxal[5.5]undecane 132 Diphenyl disulfide 54 Dipolar cycloadditions 163 Disodium trithicarbonate 57 Disulfides... 

Hussain and Nizamuddin have synthesized 1, 3-dithiolane substituted spiro-(5-lactams (Scheme 27) since 1, 3-dithiolane derivatives exhibit various biological activities like fungicidal, bactericidal, and insecticidal [97]. The starting thiadia-zoles 104 were treated with sodium hydroxide and carbon disulfide to get the corresponding disodium dithiocarbamate 105, which were stirred with 1,2-dichlo-roethane to obtain 106. Cyclocondensation of 106 with chloroacetyl chloride in dry dioxane in the presence of triethylamine gave the spiro-(5-lactams 107. These spiro-(5-lactams were found to exhibit antifungal activity 75-85% at 100-ppm concentration against P. oryzae and F. oxysporum. 

The synthesis of 4,5-dicyano-l,2,3-trithiole 2-oxide (172) starts from sodium cyanide and carbon disulfide which via (170) gave the disodium salt of 2,3-mercaptomaleonitrile (171 M = Na). Treatment of the corresponding silver salt (171 M = Ag) with thionyl chloride yielded (172) <66HC(2l-l)l). Phenylsulfine (174), prepared in situ by dehy-drohalogenation of phenylmethanesulfinyl chloride (173), slowly decomposed in ether solution at room temperature to give cis- and trans-stilbenes, mms-4,5-diphenyl-l,2,3-trithiolane 1,1-dioxide (36) and a 5,6-diphenyl-l,2,3,4-tetrathiane dioxide (68JCS(C)1612). The mechanisms of formation of these heterocycles are obscure. 

Tellurium Bis[diethyldithiocarbamate]6 2.18 g (5.0 mmol) of disodium tellurapentathionate dihydrate are dissolved in 100 m/ of water, stirred, and 50 ml of a 0.3 molar aqueous solution (15 mmol) of sodium diethyldithiocarbamate are added. The reaction mixture, which now contains a flesh-colorcd precipitate, is stirred for 5 min, and filtered. The solid is washed with water, dried over sulfuric acid under reduced pressure, and recrystallized from carbon disulfide/diethyl ether yield 2.11 g (99%) m.p. 164°. 

Disodium tetracarbonylferrate, 205-207 Disodium tetrachloropalladate, 207 Disodium tetracyanonickelate, 207 N,N -Disuccinimidyl carbonate, 208 cndo-Disulfides, 435-436... 

In the reactions of 1,1-dihalides, tin salts of 1,1-dimercaptoalkenes give somewhat better yields (only an 18% yield of 564 is obtained with the disodium salt). The reaction of active methylene compounds with carbon disulfide is a common method for obtaining 1,1-dimercaptoalkene derivatives, as exemplified in the synthesis of 565. The reaction of dimercaptoalkene salts with phosgene yields 2-keto-4-methylene-l,3-dithietanes. 

Symmetrical disulfides (73) may be prepared by reaction of alkyl halides with disodium disulfide (Scheme 43). The product is contaminated with triand polysulfides owing to the presence of impurities in the disodium disulfide however, lower members of the series of dialkyl disulfides may be purified by fractional distillation. Disulfides can also be obtained from thiols by mild oxidation, e.g. by treatment with iodine or dimethyl sulfoxide (DMSO) (Scheme 44). In the reaction with iodine, the hydriodic acid formed must be removed, otherwise the disulfide is largely reduced back to the thiol by hydriodic acid which is a powerful reducing agent. Pure unsymmetrical disulfides are more difficult to prepare owing to their tendency to undergo disproportionation they can, however, be synthesised from thiols by treatment with imides (see p. 59) or sulfenyl halides (51) (Scheme 45). 

Several dithiocarbamates are important commercial fungicides,3 e.g. maneb, which is manufactured from carbon disulfide and ethylenediamine (5). The intermediate disodium dithiocarbamate (6) is finally treated with a solution of a soluble manganese salt to yield maneb (7) (Scheme 4). Maneb is a very widely used agricultural fungicide (see Chapter 11, p. 234).3... 

Like other telluraheterocycles, oxidation of 1,3-benzotellurazole (34) with chlorine or bromine produces the Te,Te dihalide (35) reduction with aqueous disodium disulfide recovers the 1,3-benzotellurazole (Scheme 7) <88KGS276>. 

The members of the second subgroup are prepared from ethylene diamine (20) or its derivatives by reaction with carbon disulfide. In a sodium hydroxyde medium the disodium salt nabam, in an ammonium hydroxide medium, the diammonium salt amobam is formed (21). The sodium-ammonium salt, nambam, can also be prepared. These active substances are soluble in water. They cannot be used as foliage fungicides because of their phytotoxicity. On the other hand, they can be applied with good results for seed treatment. These compounds are intermediate products of the water-insoluble metal salts of N,N-ethylene-bisdithiocarbamic acid. c... 

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