Sulfides dimethyl sulfide

The impact of MOX upon reductive odors was included in the study of McCord (2003) for MOX at 5-10 mL/L/month over 5 months on a Cabernet Sauvignon wine in commercial scale tanks. Lower concentrations of methyl mercaptan and ethyl mercaptan were observed in the oxygenated wines, but no impact was seen upon disulfides, in spite of the suggestion that concentrations of the disulfides could increase due to direct oxidation of sulfides. Dimethyl sulfide concentrations were not affected, except that lower concentrations were seen in wines with added toasted oak staves or segments, with or without MOX. The concentrations of various oak extracted compounds were also measured in this study, with similar levels seen with and without MOX alongside appreciable increases due to the presence of the oak staves or segments in some cases (e.g., lactones and vanillin), oxygenation appeared to enhance aroma extraction. 

This solvent is fairly pure as received. The only impurities are water and traces of dimethyl sulfide. Dimethyl sulfide can be removed by a preliminary vacuum distillation, or by bubbling an inert gas through the solution for 10 to 20 min before use. The water content can be reduced to 10 ppm by sequential treatment with two batches of 3 A molecular sieves (activation of the sieve at 500°C for 16 h in an inert atmosphere has been advocated [62], but activation for 15 h at 300°C should suffice [52]). Calcium hydride and a number of other basic reagents have been advocated as drying agents, but in fact all of these are ineffective [32]. Tetrabutylammonium hexafluorophosphate exhibits good solubility in THF. 

Watts, S.F. (2000) The mass budgets of carbonyl sulfide, dimethyl sulfide, carbon disulfide and hydrogen sulfide. Atmos. Environ. 34, 761-779. 

Figure 2. Proposedformation of methyl sulfide, dimethyl sulfide and dimethyl disulfide from methionine (adoptedfrom Yoo et al.(31) with permission).

Methyl- 1-butanethiol Methyl sulfide Dimethyl sulfide Ethyl sulfide Diethyl sulfide... 

Sulfides Dimethyl sulfide Algae Oxidation to 20-300 pptv... 

Johnson JE, Bates TS. 1993. Atmospheric measurements of carbonyl sulfide, dimethyl sulfide, and carbon disulfide using the electron capture sulfur detector. Journal of Geophysical Research 98 23411-23421. 

According to present knowledge, hydrogen sulfide, dimethyl sulfide, carbonyl sulfide, and carbon disulfide are the most important reduced sulfur... 

The breath of a test person was analyzed over a time period of about 30 hours by means of proton-transfer-reaction mass spectrometry [55]. After ingestion of cut raw garlic, tiie components allyl metfiyl sulfide, allyl methyl disulfide, diallyl sulfide, diallyl disulfide, diallyl trisulfide, dimethyl sulfide, and acetone were detected. While the concentrations of allyl mediyl disulfide, diallyl sulfide, diallyl disulfide, and diallyl trisulfide reached maximum concentration shortly after ingestion of garlic and declined to baseline values within the next 2-3 h, concentrations of allyl methyl sulfide, dimethyl sulfide, and acetone increased much more slowly... 

Watson, W. W. (1924) Sp>ectrum of water vapKJur. Astrophysical Journal 60, 145-158 Watts, S. F. (2000) The mass budgets of carbonyl sulfide, dimethyl sulfide, carbon disulfide and hydrogen sulfide. Atmospheric Environment 34, 761-779 Wayne, R. R, I. Barnes, J. P. Burrows, C. E. Canosa-Mas, J. Hjorth, G. Le Bras, G. K. Moortgat, D. Perner, G. Poulet, G. ResteUi and H. Sidebottom (1991) The nitrate radical Physics, chemistry, and the atmosphere. Atmospheric Environment 25A, 1-203 Wayne, R, P, (1994) Singlet oxygen in the environmental sciences. Research on Chemical Intermediates 20, 395-422... 

Methyl Sulfide Dimethyl Sulfide M onobromobenzene Bromobenzene... 

---