Dimethyl sulfoxide

Molecular Structure:

IUPAC Name: methylsulfinylmethane 
Empirical Formula: C₂H₆OS
Molecular Weight: 78.1334
H bond acceptors: 1
H bond donors: 0
Freely Rotating Bonds: 0
Polar Surface Area: 36.28Ų
Index of Refraction: 1.479
Molar Refractivity: 20.17 cm³
Molar Volume: 71 cm³
Surface Tension: 43.6 dyne/cm
Density: 1.099 g/cm³
Flash Point: 85 °C
Enthalpy of Vaporization: 40.78 kJ/mol
Boiling Point: 189 °C at 760 mmHg
Vapour Pressure: 0.805 mmHg at 25°C
Melting point: 18.4 °C
InChI
InChI=1/C2H6OS/c1-4(2)3/h1-2H3
Smiles
S(C)(C)=O
EINECS: 200-664-3
Sensitive: Hygroscopic
Merck: 14,3259
BRN: 506008
Stability: Stable. Incompatible with a very wide range of materials, including acid chlorides, strong acids, strong oxidizing agents, strong reducing agents, phosphorus halides, moisture, copper wool + trichloroacetic acid. Reacts violently with a number of materials - consult a full data sheet before use. Hygroscopic.
Product Categories: Pharmaceutical Intermediates; Organics;Analytical Chemistry; Solvents for HPLC & Spectrophotometry; Solvents for Spectrophotometry; Sulfur Compounds (for Synthesis); Synthetic Organic Chemistry
Synonyms of Dimethyl sulfoxide (CAS NO.67-68-5): (CH₃)₂SO ; A 10846 ; Decap ; Deltan ; Demasorb ; Demavet ; Demeso ; DMSO

 Dimethyl sulfoxide (CAS NO.67-68-5) was first synthesized in 1866 by the Russian scientist Alexander Zaytsev, who reported his findings in in 1867. Dimethyl sulfoxide is a by-product of kraft pulping, which produces dimethyl sulfide as a side product. Oxidation of dimethylsulfide with oxygen or nitrogen dioxide gives Dimethyl sulfoxide.

  Dimethyl sulfoxide (CAS NO. 67-68-5) is an important polar aprotic solvent. It is widely used to strip photoresist in TFT-LCD 'flat panel' displays and advanced packaging applications (such as wafer-level packaging / solder bump patterning). It also used in biopresevation especially stem cell banking. It is predominantly used as a topical analgesic, a vehicle for topical application of pharmaceuticals, as an anti-inflammatory, and an antioxidant.

  Dimethyl sulfoxide (CAS NO.67-68-5) is a by-product of kraft pulping. The sulfide used as a nucleophile also attacks the methoxy groups of lignin, producing methanethiol and Dimethyl Sulfide, which is oxidized to DMSO. Suppliers of DMSO are Arkema, Toray or the Gaylord Chemical Corporation.
It reacts with methyl iodide to form a sulfoxonium salt [(CH3)3SO]I, which can be deprotonated with sodium hydride to form the sulfur ylide:
(CH₃)₂SO + CH₃I → [(CH₃)₃SO]I 
[(CH₃)₂SO ]I + NaH → [(CH₃)₂CH₂SO + NaI + H₂

Hazard Codes of Dimethyl sulfoxide (CAS NO.67-68-5): Xi
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 24/25-37/39-26-36-23
S24/25:Avoid contact with skin and eyes. 
S37/39:Wear suitable gloves and eye/face protection. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing. 
S23:Do not breathe vapour.
WGK Germany: 1
RTECS: PV6210000
F: 3
HS Code: 29309070

  Dimethyl sulfoxide with a CAS number of 67-68-5. This colorless liquid is an important polar aprotic solvent that dissolves both polar and nonpolar compounds and is miscible in a wide range of organic solvents as well as water. It has a distinctive property of penetrating the skin very readily, so that one may taste it soon after it comes into contact with the skin. Its taste has been described as oyster- or garlic-like.
Chemical Stability of Dimethyl sulfoxide (CAS NO. 67-68-5): Stable under normal temperatures and pressures. Hygroscopic: absorbs moisture or water from the air.
Conditions to Avoid: Incompatible materials, exposure to moist air or water.
  Dimethyl sulfoxide is incompatibilities with Other Materials Strong oxidizing agents, perchloric acid.
Hazardous decomposition products of Dimethyl sulfoxide are carbon monoxide, oxides of sulfur, carbon dioxide, formaldehyde.
Hazardous polymerization of Dimethyl sulfoxide will not occur.