Diethyl disulphide

G. A. Agaev and T. A. Kuliev. Antifoam composition for amine desul-phurisation of natural gas—contains tributylphosphate, and additional amyl alcohol and diethyl-disulphide to increase efficiency. Patent SU 1736550-A, 1992. 

Diethyl disulphide [110-81-6] M 122.3, b 154-155°, d 0.993, n 1.506. MgSO4 and distd under reduced pressure (optionally from CaCl2). 

If the residues of mdthomyl , an insecticide commonly used in viticulture, are present in the must they can lead to the formation of methanethiol, ethanethiol, diethyl sulphide and diethyl disulphide. If these compounds are present in wine they can give it cooked cauliflower or wet wool aromas. 

The first group of sulphur compounds mentioned above can be defined as common fermentative sulphur volatiles (CFSV) and includes in our presentation ethylmercaptan (EtSH), dimethyl sulphide (DMS), diethyl sulphide (DES), dimethyl disulphide (DMDS), diethyl disulphide (DEDS), methyl thioacetate (MTA), ethyl thioacetate (ETA), 2-mercaptoethanol (ME), 2-(methylthio)-l-ethanol (MTE), 3-(methylthio)-l-propanol (MTP), 4-(methylthio)-l-butanol (MTB), benzothiazole (BT) and 5-(2-hydroxyethyl)-4-methylthiazole (HMT) (see Table 5.6). 

Reactions of Phosphonic and Phosphinic Acid Derivatives.— The products (85) and (86) obtained by the reduction of phosphonic dichlorides and their P=S analogues with magnesium in tetrahydrofuran in the presence of a trapping agent (benzil or diethyl disulphide) are explicable in terms of an intermediate... 

The energy of activation, E2, calculated over the temperature range 30— 50°C, was equal to 16.5 kcal mole-1. Added diethyl disulphide had no effect on the kinetics. 

Figure 7.16 GC-MIP analysis of a test mixture showing FID and elemental chromatograms. 1, Deuteroacetone 2, nitroethane 3, fluorobenzene 4, toluene S, n-butyliodide 6, n-nonane 7, chlorocyclohexane 8, anisole 9, diethyl disulphide 10, octanone-2 II, bromobenzene 12, o-dichlorobenzene 13, o-bromotoluene 14, n-undecane.

Table 7. Effect of diethyl disulphide and metal ion sequestering agents on the oxidation of ethanethiol ...

Many applications of Kilpatrick and Pitzer s procedure for calculating thermodynamic properties of molecules with compound rotation have been reported. In all cases possible potential energy cross-terms between rotating tops have been neglected. Contributions from internal rotation of symmetric tops have been calculated using the appropriate tables." These tables have also been used in calculations for the internal rotation of asymmetric tops hindered by a simple -fold cosine potential. 3-Fold potential barriers have been assumed in calculations for the —OH rotations in propanol and 1-methylpropanol, the —SH rotations in propane-1-thiol, butane-2-thiol, 2-methylpropane-l-thiol, and 2-methylbutane-2-thiol, the C—S skeletal rotations in ethyl methyl sulphide, diethyl sulphide, isopropyl methyl sulphide, and t-butyl methyl sulphide, and the C—C skeletal rotations in 2,3-dimethylbutane, and 2-methylpropane-l-thiol. 2-Fold cosine potential barriers have been assumed in calculations in the S—S skeletal rotations in dimethyl disulphide and diethyl disulphide. ... 

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