Dimethyl sulfoxide

• Catalog No.: A13280
• CAS Number: 67-68-5
• M. F.: C2H6OS
• M. W.: 78.13344
• Purity: 99+%

SYNONYMS

• Title: 二甲基亚砜
• IUPAC name: methanesulfinylmethane
• IUPAC Traditional name: dimethyl sulfoxide
• Synonyms: DMSO; Methyl sulfoxide

DATABASE IDS

• CAS Number: 67-68-5
• MDL Number: MFCD00002089
• Merck Index: 143259
• EC Number: 200-664-3
• Beilstein Number: 506008

PROPERTIES

• Purity: 99+%
• Boiling Point: 189°C
• Density: 1.101
• Flash Point: 87°C(189°F)
• Melting Point: 18.4°C
• Refractive Index: 1.4790
• GHS Hazard statements: H227
• GHS Precautionary statements: P210-P280-P370+P378A-P403+P235-P501A
• RTECS: PV6210000
• Storage Warning: Hygroscopic
• TSCA Listed: 是

REFERENCES

• Tosylates or activated halides can be oxidized with DMSO to aldehydes and ketones (Kornblum oxidation). ɑ-Bromo ketones are oxidized at room temperature to ɑ-keto aldehydes: J. Am .Chem. Soc., 79, 6562 (1957). Benzylic halides, on heating in the presence of NaHCO₃, give benzaldehydes: J. Am. Chem. Soc., 114, 6227 (1992). Under similar conditions at 150^oC, primary alkyl iodides: J. Chem. Soc., 520 (1964), and alkyl chlorides and bromides in the presence of NaI: Synth. Commun., 16, 1343 (1986), are oxidized to aldehydes. Unactivated bromides have also been oxidized to aldehydes in the presence of Ag salts: Tetrahedron Lett., 917 (1974). For oxidation of benzyl alcohols to benzaldehydes, catalyzed by HBr, see: Synlett, 2041 (2002). DMSO is more often used in combination with a variety of activating agents for selective oxidation of primary and secondary alcohols to carbonyl compounds under very mild conditions. For examples, see: Oxalyl chloride, A18012, or Trifluoroacetic anhydride, A13614 (Swern oxidation), Acetic anhydride, L04295 (Albright-Goldman), N,N'-Dicyclohexylcarbodiimide, A10973 (Pfitzner-Moffatt), Sulfur trioxide-pyridine complex, A12202 (Parikh-Doering), Triphosgene, A14932 and Phenyl phosphorodichloridate, A10479. Reviews: Synthesis, 70 (1971); 165 (1981); 857 (1990).
• Aromatic amines can be substituted in the para-position by reaction with DMSO in the presence of conc. HCl with or without CuCl to give 4-aminobenzaldehydes: J. Chem. Soc., Perkin 1, 2235 (1992). The intermediate species is thought to be chloromethyl methyl sulfoxide.
• Dipolar aprotic solvent with advantages over e.g. N,N-Dimethylformamide, A13547, 1-Methyl-2-pyrrolidinone, A12260 of lower toxicity and generally higher solvent power for many types of material.
• Powerful solvent for many inorganic ions, primarily due to solvation of the cations with consequent enhanced reactivity of the counter anions both in increased nucleophilicity and base strength. In DMSO, the relative nucleophilicities of the halide ions are reversed (F^- > I^-). The rate of aromatic fluorodenitration in a range of polar aprotic solvents was highest for DMSO: J. Fluorine Chem., 35, 591 (1987); see Potassium fluoride, 14130. For enhanced base strength, see e.g.: cyclization of ω-bromo acids to lactones by K₂CO₃: Org. Synth. Coll., 6, 698 (1988); exhaustive alkylation of ketones with KOH: Tetrahedron Lett., 31, 859 (1990).
• Malonic and ?-keto esters can be conveniently decarboalkoxylated by heating in wet DMSO: J. Org. Chem., 43, 138 (1978), avoiding the need for separate hydrolysis and decarboxylation steps.
• DMSO is a very weak acid (pK_a= 31) but can be deprotonated by NaH, giving "dimsyl sodium", which is a useful strong base e.g. for the Wittig reaction: J. Org. Chem., 28, 1128 (1963).