Ethyl disulfide

PhSH, >50° or HSCH2CO2H, 45°, 15 h, quant. The 5-ethyl disulfide is stable to acid-catalyzed hydrolysis (CF3CO2H) of carbamates and to am-monolysis (25% NH3/CH3OH).-... 

BIACETYLENE) 182 C4H10S2 ETHYL-DISULFIDE -68.436 2.7360E-01 1.0156E-04 22.26... 

Unsaturated nitriles Dicyanobutenes Methyl pyridines Ethyl disulfides (HSSH) Acrylonitrile dimers... 

In soft cheeses, such as Brie, Camembert, and Limburger, the following sulfur compounds were implicated 3-(methylthio)propanol, MT, DMS, DMDS, DMTS, dimethyl tetrasulfide, methyl ethyl disulfide, diethyl disulfide, 2,4-dithiapentane, 3-methylthio-2,4-dithiapentane, methional, 2,4,5-trithiahex-ane, 1,1-fe-methylmercaptodisulfide, methyl thioacetate (=methanethiol acetate), benzothiazole, methylthiobenzothiazole, methyl ethyl sulfonate, methyl methane thiosulfonate, thiophene 2-aldehyde, and H2S.34 Many of these were only present in small amounts Limburger cheese was notable for 13.2% of DMDS, 0.5% of methyl thioacetate, and 0.8% of DMTS. 

Preparative Photolysis. The preparative photolysis of an aqueous solution (pH=8.5) of AETSAPPE (2.5 M) was conducted in a 1-inch diameter quartz test tube in a Rayonet Reactor (Southern New England Radiation Co.) fitted with 254 nm lamps. Within two hours the solution gelled and the reaction was terminated. Upon acidification the solution cleared, and the product could be re-precipitated by addition of base. This indicates loss of the thiosulfate functionality. The product was dissolved in dilute HC1, precipitated with acetone, and filtered. This process was repeated three times, and the final precipitate was washed with water. The product (20 to 30 mg) was dried in vacuo for 24 hours and stored in a dessicator until use. Comparison of the13 C NMR spectrum of the product with the starting AETSAPPE 13C NMR spectrum clearly shows that the thiosulfate methylene peak shifted upfield, from 39 ppm to 35 ppm. The complete 13 C NMR and IR analysis of the product were consistent with the disulfide product. Further, elemental analysis of the product confirmed that the product was the desired disulfide product 2-amino (2-hydroxy 3-(phenyl ether) propyl) ethyl disulfide (AHPEPED) Expected C 58.39, H 7.08, N 6.20, S 14.18 actual C 58.26, H 7.22, N 6.06, S 14.28. 

It appeared probable that the reduction of disulfides to mercaptans by means of yeast would be particularly easy, since the two substances can be interconverted quite smoothly by ordinary chemical means. This prediction did not prove to be quite correct. True, Neuberg and Schwenk could reduce a disulfide by means of yeast, but they could not do so with the expected ease. Ethyl disulfide was chosen for the experiment because its boiling point (151°) differs very much from that of ethyl mercaptan (36°). Yeast which has been killed by boiling does not convert the disulfide into the mercaptan, but fermenting yeast does in view of the physiological importance of the disulfide group in cystine and glutathione, this observation is worthy of note. 

Also, reductive desorption of SAMs of such asymmetrical disulfides as butyl hexadecyl disulfide and decyl-2(perifluoro-hexyl)ethyl disulfide has been studied on Au(lll), using CV [168]. Peak potentials corresponding to electrochemical desorption waves of the adsorbed species were different from those obtained for monolayers... 

B i s(2-ami no-2-carboxy-2-methyI-ethyl) disulfide, A021 Bls(2-aminoethyl)disulfide, AD60... 

Ethyl disulfide, IV, 95 Ethyl hydroperoxide, decomposition by catalase, V, 53... 

Ethyl disulfides, to protect thiols, 302 /V-(Ethyldithio) carbamates, to protect amines, 334... 

The most hazardous known VX hydrolysis products are persistent bis[2-(diisopropylamino)ethyl] disulfide, and highly toxic and persistent 5-[2-(diisopropylamino)ethyl] methylphosphonothioate. The decomposition of RVX gives rise to structural analogs of the above products bis[2-(diethylamino)ethyl] disulfide and 6 -[2-(diethylamino)ethyl]... 

In this chapter, we presented the principal products of RVX hydrolysis with excess water in an acid medium. It has been shown that after the 3 months exposure, close to 1% of the initial amount of RVX in the solution could be detected. According to data on RVX hydrolysis with an equimolar amount of water, the autocatalytic hydrolysis of RVX was almost completed after 3 months, since the RVX content in the sample was no more than 0.01%. Moreover, the reaction mixture was much poorer than in the case of hydrolysis with excess water. Isobutyl MPA, which catalyzes RVX degradation, was detected as the major component of the reaction mixture. Yang et al (1996) found 2-(diethyl amino)ethanethiol as the second major component of the mixture, but in our experiment it was almost completely converted into bis[2-(diethylamino)ethyl]disulfide. 

---