528021

Dimethyl sulfide

• Synonym(s): DMS, Methyl sulfide
• Linear Formula: (CH₃)₂S
• CAS Number: 75-18-3
• Molecular Weight: 62.13
• Beilstein/REAXYS Number: 1696847
• EC Number: 200-846-2
• MDL number: MFCD00008562
• UNSPSC Code: 12352200
• PubChem Substance ID: 329757889

Properties

• vapor density: 2.1 (vs air)
• vapor pressure: 26.24 psi ( 55 °C); 7.79 psi ( 20 °C)
• assay: ≥99%
• autoignition temp.: 402 °F
• expl. lim.: 19.7 %
• availability: available only in EU
• refractive index: n20/D 1.435 (lit.)
• bp: 38 °C (lit.)
• mp: −98 °C (lit.)
• solubility: water: soluble 7.28 g/L at 20 °C
• density: 0.846 g/mL at 25 °C (lit.)
• storage temp.: 2-8°C
• SMILES string: CSC
• InChI: 1S/C2H6S/c1-3-2/h1-2H3
• InChI key: QMMFVYPAHWMCMS-UHFFFAOYSA-N

Description

General description

Dimethyl sulfide (DMS) is a biogenic sulfur compound[1] that is released from the ocean to the atmosphere.[2] It forms the main component of the global sulfur cycle.[1][2] The thermal decomposition behavior of dimethyl sulfide in gas phase has been investigated in a static system at 681-723K.[3] The mechanism of its photochemical oxidation in atmosphere has been described.[2] The rate constants of the gas phase reaction between OH radicals and DMS have been determined by relative rate method and flash photolysis.[4] The differential Raman cross section, σ_DMS at different excitation wavelengths has been measured.[1] The adsorption of DMS on activated carbons (ACs) has been reported to take place by hydrogen bonding.[5]

Application

Dimethyl sulfide may be used to prepare methanethiol by thiolation reaction with hydrogen sulfide (H₂S) in the presence of tungsten-zirconia (WO₃/ZrO₂) catalyst.[6]

Legal Information

Product of Arkema

Safety Information

• pictograms: GHS02
• signalword: Danger
• hcodes: H225
• pcodes: P210 - P233 - P240 - P241 - P242 - P243
• Hazard Classifications: Flam. Liq. 2
• Storage Class: 3 - Flammable liquids
• wgk_germany: WGK 1
• flash_point_f: -32.8 °F - closed cup
• flash_point_c: -36 °C - closed cup
• ppe: Eyeshields, Faceshields, Gloves