Dimethyl sulfoxide (DMSO) is a sulfur-containing organic compound that is a colorless, odorless, transparent liquid at room temperature and is a hygroscopic flammable liquid. It has high polarity, high boiling point, good thermal stability, aprotic and water-miscible properties. It is soluble in most organic substances such as ethanol, propanol, benzene and chloroform. It is known as “universal solvent”. Heating in the presence of an acid produces a small amount of a compound such as methyl mercaptan, formaldehyde, dimethyl sulfide, methanesulfonic acid or the like. It decomposes at high temperatures, reacts violently with chlorine, and emits a light blue flame in the air. Can be used as organic solvent, reaction medium and organic synthesis intermediates. It can also be used as a dyeing solvent for synthetic fibers, a dye remover, a dye carrier, and an absorbent for recovering acetylene and sulfur dioxide.
Colorless viscous liquid. Combustible, almost odorless, with bitterness and hygroscopicity. In addition to petroleum ether, it can dissolve common organic solvents. It can be miscible with water, ethanol, acetone, acetaldehyde, pyridine, ethyl acetate, dibutyl phthalate, dioxane and aromatic compounds, and is insoluble in aliphatic hydrocarbon compounds other than acetylene.  It has strong hygroscopicity. At 20 ° C, when the relative humidity is 60%, it can absorb 70% of its own weight from the air. This product is a weak oxidant, and the non-aqueous dimethyl sulfoxide is not corrosive to metals. It is corrosive to metals such as copper when it contains water, but it does not corrode aluminum. Stable to alkali. Heating in the presence of an acid produces a small amount of methyl mercaptan; formaldehyde; dimethyl sulfide; methanesulfonic acid and the like. It decomposes at high temperatures, reacts violently with chlorine, and emits a light blue flame in the air.
Dimethyl sulfoxide is reduced to form methyl sulfide. Oxidized to dimethyl sulfone by a strong oxidizing agent;
2. When dimethyl sulfoxide is contacted with an acid chloride such as cyanuric chloride, benzoyl chloride, acetyl chloride, phenylioioyl chloride, thionyl chloride, sulfuryl chloride or phosphorus trichloride, a severe exothermic decomposition reaction occurs. Combined with nitric acid to form (CH3)2SO·NHO3. The action of cesium carbonate can regenerate dimethyl sulfoxide. It reacts with concentrated hydriodic acid to form a dimethyl sulfonate compound.
3. Dimethyl sulfoxide has water absorption and needs to be dried before use.
Cool,dry and hermetic place
Used as an analytical reagent and a gas chromatographic fixative, also used as a solvent for UV spectroscopy