Sulphide dimethyl

LPG is considered to be non-toxic witli no chronic effects, but the vapour is slightly anaesthetic. In sufficiently high concentrations, resulting in oxygen deficiency, it will result in physical asphyxiation. The gases are colourless and odourless but an odorant or stenching agent (e.g. methyl mercaptan or dimethyl sulphide) is normally added to facilitate detection by smell down to approximately 0.4% by volume in air, i.e. one-fifth of the lower flammable limit. The odorant is not added for specific applications, e.g. cosmetic aerosol propellant. 

Dimethyl sulphide, (CH3)2S, is a foul-smelling liquid, found in minute quantity in the essential oils of peppermint and geranium. It boils at 37°. 

A convenient route to both saturated and unsaturated acylsilanes lies in the hydroboration-oxidation of alkynylsilanes (Chapter 7). Recent improvements (6) to this method involve the use of the borane-dimethyl sulphide complex for hydroboration, and of anhydrous trimethylamine A-oxide for the oxidation of the intermediate vinyl boranes. 

Bis(trimethylsilyl)propyne, 141 Bis(trimethylsilyl)terminai alkynols, 97 Borane-dimethyl sulphide. 84 Bromination-dcsilicobromination, 17-18... 

Dimethyl sulphide, dimethyl sulphoxide, dimethyl sulphone... 

The photolysis of dimethyl sulphoxide (at 253.7 nm) in a wide range of solvents has been studied in detail176. Three primary reactions occur, namely (i) fragmentation into methyl radicals and methanesulphinyl radicals, equation (60), (ii) disproportionation into dimethyl sulphone and dimethyl sulphide, equation (61) and (iii) deactivation of the excited state to ground state dimethyl sulphoxide. All chemical processes occur through the singlet state. Further chemical reactions of the initial photochemical products produce species that have been oxidized relative to dimethyl sulphoxide. 

Legrand, M., Feniet-Saigne, C., Saltzman, E. S. et al. (1991). Ice core record of oceanic emissions of dimethyl sulphide during the last climate cycle. Nature 350,144-146. 

Cyanogen chloride 0.25/a Cyclohexane 100/a Diethyl ether 100/a Dimethyl formamide 10/b Dimethyl sulphate 0.005/c Dimethyl sulphide 1/a Epichlorohydrin 5/b Ethyl acetate 200/a Ethyl benzene 30/p... 

Methyl sulphate, see Dimethyl sulphate Methyl sulphide, see Dimethyl sulphide ... 

Dimethyl sulphide detonates when it is heated at 210 C with oxygen. This was predictable since this temperature is very close to the AIT of the sulphide present in air and thus a fortiori in oxygen. 

The effect of nitric acid on dimethyl sulphide in the presence of dioxan gives rise to a detonation, even at liquid nitrogen temperatures. There is no factor in this description that can prove whether the accident is related to sulphide or dioxan, which probably gives rise to dangerous reactions with nitric acid. 

Xenon difluoride detonates in the presence of dimethyl sulphide if no solvent is used. This behaviour is not surprising at all. 

CiHeS Dimethyl sulphide CsHsNO Ethylene cyanohydrin... 

ETHYLENE GLYCOL ETHYL MERCAPTAN DIMETHYL SULPHIDE ETHYL AMINE DIMETHYL AMIDE MONOETHANOLAMINE ETHYLENEDIAMINE ACRYLONITRILE PROPADIENE METHYL ACETYLENE ACROLEIN ACRYLIC ACID VINYL FORMATE ALLYL CHLORIDE 1 2 3-TRICHLOROPROPANE PROPIONITRILE CYCLOPROPANE PROPYLENE 1 2-DICHLOROPROPANE ACETONE ALLYL ALCOHOL PROPIONALDEHYDE PROPYLENE OXIDE VINYL METHYL ETHER PROPIONIC ACID ETHYL FORMATE METHYL ACETATE PROPYL CHLORIDE ISOPROPYL CHLORIDE PROPANE... 

Dimethyl propane Dimethyl sulphate Dimethyl sulphide Dimethyl sulphoxide... 

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