Diethyl sulfide

Hydrogen sulfide reacts with olefins under various conditions forming mercaptans and sulfides (108,109). With ethylene it can react to ultimately give diethyl sulfide (110). With unsymmetrical olefins, the direction of addition can be controlled by the choice of either a free-radical initiator, including ultraviolet light, or an acidic catalyst (110) ... 

Organic acids, including carbon dioxide, lower the wort pH during fermentation. The principal acids formed are lactic, pymvic citric, malic, and acetic acids, at concentrations ranging from 100—200 ppm. The main sulfur compounds formed during fermentation and thek perception thresholds are as follows H2S (5—10 ppb) ethanethiol (5—10 ppb) dimethyl sulfoxide (35—60 ppb) and diethyl sulfide (3—30 ppb). At low levels, these may have a deskable flavor effect at higher levels they are extremely undeskable. Sulfur dioxide also forms during fermentation, at concentrations of 5—50 ppm its presence can be tasted at levels above 50 ppm. 

Diethyl sulfide Ethyl sulfide 189 C4Hi S n-Octane 8 CaHi8... 

Diethyl sulfide [352-93-2] M 90.2, m 0 /15mm, 90.1 /760mm, d 0.837, n 1.443. Washed with aq 5% NaOH, then water, dried with CaCl2 and distd from sodium. Can also be dried with MgS04 or silica gel. Alternative purification is via the Hg(II) chloride complex [(Et)2S.2HgCl2] (see dimethyl sulfide). 

Diphenylimidazole with palladium acetate forms the cyclometallated complex 80 (X = OAc) (97AOC491). The acetate group is replaced by chloride or bromide when 80 (X = OAc) reacts with sodium chloride or lithium bromide, respectively, to give 80 (X = C1, Br). Bromide with diethyl sulfide forms the mononuclear complex 81. Similar reactions are known for 1 -acetyl-2-phenylimidazole (96JOM(522)97). 1,5-Bis(A -methylimidazol-2-yl)pen-tane with palladium(II) acetate gives the cyclometallated complex 82 (OOJOM (607)194). 

The thiophosphate phorate is degraded in aqueous solutions at pH 8.5 to yield diethyl sulfide and formaldehyde, which are formed by nucleophilic attack either at the P = S atom or the methylene dithioketal carbon atom (Hong and Pehkonen 1998). 

Sulfur-containing materials MRH Sulfur 3.64/15, diethyl sulfide 4.27/28... 

Correlation with the EGA-mass spectra allows for the assignment to the initial loss of diethyl sulfide, as supported by the library fit and from the assignment of the fragment and parent ions (m/z = 90) (see Fig. 6.8a). After approximately 15 min, mass-spec EGA shows the absence of peaks assignable to Et2S... 

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