Dimethyldisulfide

DIMETHYLCYCLOHEXANE DIMETHYLCYCLOHEXYL AMINE DIMETHYLDIETHOXYSILANE DIMETHYLDIOXANE DIMETHYLDISULFIDE... 

Dimethylbutane, 56 Dimethyl carbamoyl chloride, 56 Dimethyldichlorosilane, 56 Dimethyldiethoxysilane, 56 Dimethyldisulfide, 56... 

DMSO or other sulfoxides react with trimethylchlorosilanes (TCS) 14 or trimefhylsilyl bromide 16, via 789, to give the Sila-Pummerer product 1275. Rearrangement of 789 and further reaction with TCS 14 affords, with elimination of HMDSO 7 and via 1276 and 1277, methanesulfenyl chloride 1278, which is also accessible by chlorination of dimethyldisulfide, by treatment of DMSO with Me2SiCl2 48, with formation of silicon oil 56, or by reaction of DMSO with oxalyl chloride, whereupon CO and CO2 is evolved (cf also Section 8.2.2). On heating equimolar amounts of primary or secondary alcohols with DMSO and TCS 14 in benzene, formaldehyde acetals are formed in 76-96% yield [67]. Thus reaction of -butanol with DMSO and TCS 14 gives, via intermediate 1275 and the mixed acetal 1279, formaldehyde di-n-butyl acetal 1280 in 81% yield and methyl mercaptan (Scheme 8.26). Most importantly, use of DMSO-Dg furnishes acetals in which the 0,0 -methylene group is deuter-ated. Benzyl alcohol, however, affords, under these reaction conditions, 93% diben-zyl ether 1817 and no acetal [67]. 

Hydrotreating was carried out at 3.1 MPa (450 psig) and 613 K (340 °C) in a three-phase upflow fixed-bed reactor (Figure 1). The feed liquid was prepared by combining different quantities of 1.0 wt% tetralin (Aldrich, 99%), 0.02 wt% N as quinoline (Aldrich, 99%), 0.05 wt% S as 4,6-dimethyldibenzothiophene (4,6-DMDBT, Fisher, 95%), 0.3 wt% S as dimethyldisulfide (DMDS, Aldrich, 99%), n-octane (Aldrich, 99%), and balance n-tridecane (Alfa Aesar, 99%). Liquid product compositions were determined with a Hewlett-Packard 5890A chromatograph equipped with a 50 m dimethylsiloxane colunm (Chrompack, CPSil 5B) of 0.32 mm i.d. Reaction products were identified by matching retention times with commercially available standards. 

Zeneroli ML, Ventura E, Baraldi M, Penne A, Messori E, Zieve L Visual evoked potentials in encephalopathy induced by galactosamine, ammonia, dimethyldisulfide and octanoic acid. Hepatology 1982 2 532-538. 

Iliuta, M.C. and Larachi, F. Solubility of dimethyldisulfide (DMDS) in aqueons solntions of Fe(HI) complexes of trans-1,2-cyclohexanediaminetetraacetic acid (CDTA) using the static headspace method. Fluid Phase Equlllb., 233(2) 184-189,2005. 

Compound 1 (500 mg, 1.39 mmol from photolysis of stilbene and 2-methylmer-capto-benzothiazole) was sealed under vacuum in a thick-walled Pyrex tube (the volume was about 100 mL) and heated to 200 °C for 20 h in the dark. Methan-ethiol (from the [2,l,3]-elimination) and dimethyldisulfide were condensed to a cold trap (-196 °C) at a vacuum line (65 mg, 97%). The residue was separated by preparative TLC on 200 g SiC>2 with benzene to give 340 mg (78%) of 2 (mp 108 °C, methanol) and 96 mg (22%) of 3. 

Coastal wetlands have long been noted for their relatively high emission of volatile sulfur gases to the atmosphere indeed the typical odor of marshes often is due largely to DMS. Several studies have reported emissions of DMS, H2S, and other sulfur compounds, dimethyldisulfide, carbonyl sulfide, and carbon disulfide (10-12.40-42). DMS and H2S constitute the bulk of the flux, with DMS predominating in vegetated areas and H2S in mud flats. Fluxes of DMS... 

Some volatile compounds such as methanethiol, dimethylsulfide and dimethyldisulfide have been shown to yield methane when they were added to anaerobic cultures derived from aquatic sediments (70. 71V Kiene et al. (22) showed that methane bacteria and sulfate-reducers competed for dimethyldisulfide when it was added at low concentrations to anaerobic aquatic sediments. They also isolated a methanogen that metabolized dimethyldisulfide to methane and carbon dioxide (72). Recently Oremland et al (22) detected trace amounts of ethane released from anoxic sediment slurries. This could be stimulated by the addition of ethanethiol or diethylsulfide and inhibited by the addition of bromoethanesulfonic acid which specifically inhibits methane bacteria. These results indicated that methane bacteria co-metabolized these two OSC. 

Multicomponent tandem addition reactions have been investigated by Russell and coworkers. Addition of t-butyl radical to the allyl acrylate 70 with termination from dimethyldisulfide furnishes butyrolactone 71 as a diastereomeric mixture (remote center). However, the ring junction stereochemistry is exclusively trans [95JA3645],... 

The second, even more convenient, method to determine double-bond positions in unsaturated hydrocarbons is the use of dimethyldisulfide derivatives (Francis and Veland, 1981 Carlson et al, 1989 Howard, 1993). In this approach, alkenes are dissolved in a carbon disulfide and iodine solution and kept overnight. The reaction yields a derivative with methyl sulfide substituents on each of the carbons that comprised the double bond. If the double bonds are separated by four or more methylene groups, the reaction proceeds... 

Tropospheric oxidation of the so-called reduced sulfur , mostly dimethylsul-fide, hydrogen sulfide, and dimethyldisulfide, is thought to proceed via several... 

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