Dimethyl dimethylsulfoxide

THF, tetrahydrofuran DMSO. dimethylsulfoxide TEA, triethylamine DMF. dimethyl-formamid. 

Phosphoryl chloride Carbon disulflde, A,A-dimethylformamide, 2,5-dimethylpyrrole, 2,6-dimethyl-pyridine 1-oxide, dimethylsulfoxide, water, zinc... 

Mixtures which are Unstable or Explosive Dimethyl Sulfoxide. A violent expin occurs when a drop of 70% perchloric ac is added to 10ml of dimethylsulfoxide (Ref 40)... 

Note It is reported that the use of chlorobenzene as solvent is essential when the reagent is to be used to detect aromatic amines [1]. In the case of steroids, penicillins, diuretics and alkaloids the reaction should be accelerated and intensified by spraying afterwards with dimethylsulfoxide (DMSO) or dimethylformamide (DMF), indeed this step makes it possible to detect some substances when this would not otherwise be possible [5,9-11] this latter treatment can, like heating, cause color changes [5,9]. Penicillins and diuretics only exhibit weak reactions if not treated afterwards with DMF [10, 11]. Steroids alone also yield colored derivatives with DMSO [9]. Tlreatment afterwards with diluted sulfuric acid (c = 2 mol/L) also leads to an improvement in detection sensitivity in the case of a range of alkaloids. In the case of pyrrolizidine alkaloids it is possible to use o-chloranil as an alternative detection reagent however, in this case it is recommended that the plate be treated afterwards with a solution of 2 g 4-(dimethyl-amino)-benzaldehyde and 2 ml boron trifluoride etherate in 100 ml anhydrous ethanol because otherwise the colors initially produced with o-chloranil rapidly fade [12]. 

More recently, this method has been extended to preparation of a variety of disulfonium dications from both acyclic and cyclic bis-sulfides, including very labile dications not observed when other methods were used.78 Thus, simple acyclic S-S dications were prepared by an intermolecular reaction of a monosulfide, a monosulfoxide and triflic anhydride.79 In the first step, reaction of triflic anhydride with dimethylsulfoxide generates a highly electrophilic80 complex 50 (dimethyl sulfide ditriflate).81 The latter reacts with dimethyl sulfide to give labile tetramethyldisulfonium dication 51 identified by NMR spectroscopy.79 In a similar manner, bis-(tetramethylene)disulfonium dication 52 is obtained from tetrahydrothiophene and its S-oxide (Scheme 17). 

DMAC N.Ar -dimethyl acetamide DMF A". Ar -di methyl form ami de DMSO dimethylsulfoxide MeCN acetonitrile THF tetrahydrofuran... 

N. N- d i e thyl amino)diazenolate 2,9 -dimethyl-1,10 -phenanthroline Dimethylsulfoxide ethylendiaminetetraacetic acid electron spin resonance Fourier transform infrared Glutathione guanylyl triphosphate ferro-hemoglobin... 

DeBruyn, W. J., Shorter, J. A., Davidovits, P, Worsnop, D. R., Zahniser, M. S., and Kolb, C. E. Uptake of Gas-Phase Sulfur Species Methanesulfonic-Acid, Dimethylsulfoxide, and Dimethyl Sulfone by Aqueous Surfaces, J. Geophys. Res.-A., 99, 16927-16932, 1994. 

Extracting the crude product with a dipolar aprotic solvent, such as dimethyl-formamide or dimethylsulfoxide. 

Fig. 8.3 Dimethylsulfoniopropionate and dimethyl sulfide cycling in the open ocean. DMSO dimethylsulfoxide, CCN cloud condensation nuclei, MMPA 3-methylpropionate, ji-HP (S-hydrox-ypropionate, 3-MPA 3-mercaptopropionate, MeSH methanethiol, X-CH unidentified molecule with a terminal methyl group. (Reprinted from Yoch 2002, with permission from D. Yoch and the American Society for Microbiology)...

The reaction of dimethyl bis(methyIthio)methy enemalonate and ben-zamidine hydrochloride in the presence of sodium methylate (83H1745), or in the presence of potassium carbonate in dimethylsulfoxide at 100°C for... 

Polymers containing pendant carbamate functional groups can be prepared by the reaction of phenyl isocyanate with poly(vinyl alcohol) in homogeneous dimethylsulfoxide solutions using a tri-ethylamine catalyst. These modified polymers are soluble in dimethyl sulfoxide, dimethylacetamide, dimethylformamide and formic acid but are insoluble in water, methanol and xylene. Above about 50% degree of substitution, the polymers are also soluble in acetic acid and butyrolactone. The modified polymers contain aromatic, C = 0, NH and CN bands in the infrared and show a diminished OH absorption. Similar results were noted in the NMR spectroscopy. These modified polymers show a lower specific and intrinsic viscosity in DMSO solutions than does the unmodified poly(vinyl alcohol) and this viscosity decreases as the degree of substitution increases. 

High-spin, five-coordinate complexes are known of type [MnLXJPFg (X = F, Cl, Br, or I and L = 2,9-dimethyl-3,10-diphenyl-1,4,8,11-tetraazacyclotetra-l,3,8,10-tetraene). Electrochemical investigation of these complexes revealed that they are surprisingly resistant to oxidation in dimethylsulfoxide." ... 

Much of the methyl mercaptan and dimethyl sulfide can be oxidized to dimethylsulfoxide (DMSO), a useful side product that is a common polar, aprotic solvent in the chemical industry. This is in fact the primary method... 

Dimethylformamide Dimethylglyoxime mono-anion 2,9-Dimethyl-1,10-phenanthroline Dimethylsulfoxide (upper case for solvent, lower-for ligand)... 

D. TRIS(DIMETHYL SULFOXIDE)INDIUM(III) BROMIDE [TRIBROMO-TRIS(DIMETHYLSULFOXIDE)INDIUM(III)j... 

Aus [Pg.808]

AA BAA CMC CPB CTAB DM SO IPC MVPQ PAA PDADMAB PEG PIPAA SDS SMA TEMED acrylamide methylene bisacrylamide critical micelle concentration cetylpyridinium bromide cetyltrimethylammonium bromide dimethylsulfoxide interpolymer complex methylvinylpiridine units quaternized by dimethyl sulfate poly(acrylamide) poly(diallyldimethylammonium bromide) polyethylene glycol) poly(isopropylacrylamide) sodium dodecyl sulfate sodium methacrylate tetramethylethylenediamine... 

Isatin, JV-methylisatin, and JV-hydroxyisatin can be reduced to semidiones by treatment with the enolate anion of propiophenone in dimethylsulfoxide.258 Nitroxides are prepared from iV-hydroxyisatin by treatment with lead dioxide in dioxan, while another nitroxide was formed spontaneously from iV-hydroxyisatin in basic dimethyl sulfoxide solution in the presence of oxygen.256... 

To a 250 ml flask equipped with a stirrer, a thermometer, a water condenser and Dean-Stark trap was added 11.42 g of 4.4 -isopropylidenediphenol (0.05 moles), 13.1 g of a 42.8% potassium hydroxide solution (0.1 mole KOH), 50 ml of dimethyl sulfoxide and 6 ml of benzene. The reaction mixture was kept under an atmosphere of nitrogen and the water was azeotroped oft over a 3 to 4 hours period (130—135° C). At the end of this time the reaction mixture consisted of the potassium salt of the biphenol and was essentially anhydrous. After cooling the mixture there was added 14.35 g (0.05 moles) of 4.4 -dichlorodiphenyl sulfone and 40 ml of anhydrous dimethylsulfoxide. The reaction mixture was maintained, under a nitrogen atmosphere, between 130 and 140° C with stirring for 4 to 5 hours. The viscous orange solution was then poured into 300 ml of water in a Waring Blendor and the polymer separated by filtration and dried at 110° for 16 hours. A yield of 22.2 g (100%) of polymer with a reduced viscosity in chloroform (0.2 g per 100 ml at 25°) of 0.59 was obtained. 

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