Methanesulfonic add

Methoxy-4 -nitrobiphenyl 1,1 -Biphenyl, 4-methoxy-4 -nitro- (9) (2143-90-0) 4-Nitrophenyl trifluoromethanesulfonate Methanesulfonic acid, trifluoro-, p-nitrophenyl ester (8) Methanesulfonic add, trifluoro-, 4-nitrophenyl ester (9) (17763-80-3)... 

Bromoanlsole Anisole, o-bromo- (8) Benzene, 1-bromo-2-methoxy- (9) (578-57-4) Methyl trifluoromethanesulfonate Methanesulfonic add, trifluoro-, methyl ester (8,9) (333-27-7)... 

Oxidation of DMDS by Oy. When an aqueous solution of DMDS is ozonized, the major product formed is methanesulfonic add with trace amount of methyl methanethiolsulfonate (CH3S02SCH3). The reaction is complex mechanistically but a simple sequence can be envisaged as ... 

Sodium triflate Methanesutfonic acid, trifluoro-, sodium salt (8,9) (2926-30-9) Trifluoromethanesulfonic add Methanesulfonic add, trifluoro- (8,9) (1493-13-6) Fluorine (8,9) (7782-41-4)... 

Protection of phenols by the foregoing methods is complicated by the rapid Friedel-Crafts rearrangement of the nascent rm-butyl ether. By using trifluoro-methanesulfonic add at -78 PC, the rate of /erf-butyl ether formation is fast and the Friedel-Crafts alkylation does not compete [Scheme 4.126].226 Similarly, attempts to deprotect phenol ferf-butyl ethers with trifluoroacetic acid or titanium tetrachloride may give complex mixtures, again as a result of Friedel-Crafts alkylation of the phenol but this side reaction can be suppressed by using a catalytic amount of trifluoromethanesulfonic acid in 2.2,2-trifluoroethanol as solvent at -5 DC. 

Strong protic acids will also cleave benzyl ethers. A highly stereoselective synthesis of the sex pheromone of the drugstore beetle Stegobium paniceum by Matteson and co-workers277 conveniently accomplished the debenzylation of the benzyl ether 151.1 with methanesulfonic add in chloroform [Scheme 4.151]. 

A new quality in ladder polymer synthesis via multifunctional polycondensation was reached in the late 1960s when poly(benzimidazobenzo-phenanthroline) (BBL) 12 was prepared by Arnold and van Deusen [21 -24]. The polymer was synthesized from naphthalene-l,4,5,8-tetracarboxylic acid dianhydride (11) and 1,2,4,5-tetraaminobenzene (la) in strong acidic media (polyphosphoric acid, sulfuric acid). BBL is completely soluble in concentratal sulfuric acid or methanesulfonic add and is processible into durable films and... 

Table 7,5. Capacity factors (k ) in organic and mixed solvents with 0.5 mM methanesulfonic add as the...

Some years ago, Malmstrom etal. synthesized water-soluble metal phosphine complexes based on water-soluble polymers [41], In order to have solubility in both an acidic and a basic medium, they prepared two different water-soluble polymers. For the first, they made methyl [4-(diphenylphosphino)benzyl]amine (PNH) react with poly(acrylic acid) (PAA) using dicydocarbodiimide (DCC) as the coupling agent, under strict exclusion of oxygen (25). For the second, they reacted (4-carboxy-phenyl)diphenylphosphine with polyethylene imine (PEI) at room temperature (26). The reduction by sodium borohydride was made in situ, followed by the addition of methanesulfonic add and diethyl ether. Then, the methanesulfonic salt of phosphinated polyethylenimine was predpitated. 

Dimethylfoimamide. Lithium diisupiupylamide. p-Toluene sulfonyUiydrazine. SILYLATION N,0-Bis(trimethyl iIyl) ulfonate. Ethyl trimethylsilylacetate. Trifluoro-methanesulfonic add trimethylsilyl ester. N-(Trimethylsilyl)imidazole. SPIROCYCLIZATION Pyriolidine. 

Dlcumyl peroxide Dimethyl ether, Methanesulfonic add Peracetic acid Sodium formaldehyde sulfoxylate ... 

C, Carbide, iron complex, 26 246 ruthenium cluster complexes, 26381-284 CHF3O3S, Methanesulfonic add, trifluoro-, iridium, manganese, and rhenium com-iriexes, 26 114,115,120 platinum complex, 26 126 CHOS2, Dithioaubonic add, 27 287 CH2> Methylene, osmium complex, 27 206 CH2O2, Formic add, rhenium complex, 26 112... 

OgFSgCioHg. 2,2--Bi-l,3-dithiolo[4,5-l>]-[l,4]dithiinylidene fluorosulfate, 26 393 O3F3SCH, Methanesulfonic add, trifluoro-,... 

SF3K2MnOg, Manganate(IIIX trifluoro-sulfato-, dipotassium, 27 312 SF3MnOgCg, Manganese(IX pentacarbonyl-(trifluoromethanesulfonato)-, 26 114 SF3O3CH, Methanesulfonic add, trifluoro-, 28 70... 

Column (jiBondapak C18 (A), or pBondapak alkyl phenyl (B), or pRondapak CN (C) Mobile phase MeOH water acetic acid 20 79 1 containing 5 mM methanesulfonic add... 

TABLE 2.8 Variation in Properties of the As-Spun Polyaniline Fiber after Steam Dedoping and Redoping with Methanesulfonic Add... 

The AMPSA-doped polyaniline liber that was exposed 17 s in ethyl acetate coagulation bath (Table 2.7) was subsequently exposed to steam at 20 psi for 2 h to dedope the liber and was tben reprotonated by soaking the dedoped liber in 10 wt% methanesulfonic add in methanol for 19 h. The methanesulfonic acid was dissolved in methanol instead of water, as this improves the tensile properties of the redoped fibers. The physical properties of these fibers (Table 2.8) are important in that they show that the steam-dedoped sample is the strongest PANl fiber made in our laboratory to date, in terms of tensile strength and modulus. 

Potassium chloride Aliquat 336 Halides from methanesulfonic add esters Optically-active sec. halides Inversion of configuration Phase transfer catalysis... 

Chloropyridine-3-carboxylic adds. A mixture of 2-hydroxypyridine-3-carboxylic add, 9 eqs. SOClj, and 3 eqs. methanesulfonic add refluxed for 7 h - 2-chloropyridine-3-carboxylic add. Y 82%. SOCb is a useful alternative to phosphorus chlorides yields are high, by-products (HCl and SO2) are easily removed, work-up is easy, and considerably less base is required to neutralize the product mixture. F.e. inch 3,6-dichloropyridazine s. G.L. Goe et al., Chem. Ind. 1987, 694-5. 

A novel kind of flow lead-add battery with no separator and single electrolyte, lead(II) in methanesulfonic add has been proposed recently [373]. 

The CSRS-SC is a post-column electrolytic eluant suppressor package consisting of an Eluant Suppressor component (ES) and an Analyte Converter component (AC) that enables the suppressed conductivity detection of low-level ammonium and other amines. Figure 4-36 illustrates the ion movement through a CSRS-SC in detail. The eluant and the ammonium analyte (an example of the cation analytes) exit the analytical column as methanesulfonic acid (H+MSA ) and ammonium methanesulfonate (NH4+MSA ). In the Eluant Suppressor component, the majority of the eluant is suppressed to water and the analyte is converted to the base form, NH4+OH . However, a small amount of MSA reenters the eluant chamber near the exit, which converts the analyte back to the salt form, so that the analyte exits the Eluant Suppressor component as NH4+MSA in a background of dilute methanesulfonic add. In the Analyte Converter (AC) component, the NH4+ analyte cation is exchanged for a hydronium ion, resulting in conversion of the analyte to methanesulfonic acid, H+MSA . 

---