1-dodecanesulfonic acid

Alternatively, ionic compounds can be recovered from solution on hydrophobic sorbents using ion-pair SPE (IP-SPE). Carson [121] notes that advantages of IP-SPE over ion-suppression RP-SPE or ion-exchange SPE include selectivity, compatibility with aqueous samples and rapid evaporative concentration of eluents, and potential application to multiclass multiresidue analysis. IP reagents (e.g., 1-dodecanesulfonic acid for pairing with basic analytes or tetrabutylammonium hydrogen sulfate for pairing with... 

Because the micellar interior is far from being rigid, a solubilized substrate is relatively mobile. Like micelle formation, solubilization is a dynamic equilibrium process. Representative recent examples are the solubilization of benzene, naphthalene, anthracene, and pyrene in aqueous solution by the addition of 1-dodecanesulfonic acid [391], the solubilization of fullerene Ceo in aqueous solutions of the non-ionic surfactant Triton X-100 [392], and the solubilization of a cholesteryl-group bearing pullulane (a hydrophobized polysaccharide) [393]. 

Dodecanesulfonic acid Et ester, in D-00238 1-Nonanesulfonic acid /er/-Butyl ester, in N-00032... 

Increased retention of the analytes can also be achieved by addition of various ion-pair reagents in the mobile phase Tetrabutylammonium cations have typically been used as counter ions, at around pH 6.5, to increase retention and improve the selectivity in the analysis of monobasic penicillins (105, 123). Alkyl-sulfonic acids have been also used to improve the separation of -lactams bearing an amine function in their side chain or having a neutral side chain. Heptanesul-fonic acid (80, 103), decanesulfonic acid (87, 93, 106), dodecanesulfonic acid (77, 107-110), or mixtures of octanesulfonic and dodecanesulfonic acids (73, 75, 78, 79) constitute the principal alkylsulfonic acids used in -lactam analysis. In some applications, heptafluorobutyric acid (74, 76) or sodium thiosulfate (90, 112, 115, 116, 121, 122) has also been used as an ion-pairing reagent. 

More energetic oxidation of thiols leads to sulfonic acids, Thiophenol dissolved in a solution of potassium hydroxide in dimethylformamide is oxidized by oxygen at 23.5 °C over a 22-h period to benzenesulfonic acid in 91% yield [53], Lauryl mercaptan gives dodecanesulfonic acid in 100% isolated yield upon treatment with potassium peroxymonosulfate, 2KHS05 KHS04 K2S04, at room temperature for 30 min [205]. 

Sinou and co-workers [73] studied the influence of different surfactants on the palladium-catalyzed asymmetric alkylation of l,3-diphenyl-2-propenyl acetate with dimethyl malonate in presence of potassium carbonate as base and non-water-soluble chiral ligands. Best results in activity and enatioselectivity (> 90% ee) were observed with 2,2 -bis(diphenylphosphino)-l,l -binaphthyl (BINAP) as ligand and cetyltrimethylammonium hydrogen sulfate as surfactant in aqueous medium. Water-stable Lewis acids as catalysts for aldol reactions were developed by Kobayashi and co-workers [74]. An acceleration of the reaction was indicated in presence of SDS as anionic surfactants. An additional promotion could be observed by combination of Lewis acid and surfactant (LASCs = Lewis acid-surfactant-combined catalysts) as shown in Eq. (3). Surfactant the anion of dodecanesulfonic acid. 

Mobile phase MeCN MeOH triethylamine 85% phosphoric acid water 15 5 0.4 0.4 79.2 containing 2 mM octanesulfonate and 2 mM dodecanesulfonate (UV) or isopropanol acetic acid in 200 mM ammonium acetate water 1.5 5 93.5 (MS)... 

Mobile phase MeCN water 25 75 containing 5 mM sodiiun dodecanesulfonate and 0.1% phosphoric acid Column temperature 40 Flowrate 0.8 Ii ection volume 10-60 Detector UV 259... 

Mobile phase MeCN MeOH water 15 2 83 containing 3 mM dodecanesulfonate, 1.5 mM octanesulfonate, 0.4% phosphoric acid, and 0.4% triethylamine... 

Water-stable Lewis acids as catalysts for aldol reactions were developed by Kobayashi and co-workers [22]. A high promotion could be observed by combination of Lewis acid and surfactant (LASCs = Lewis acid-surfactant combined catalysts as shown in Eq. (2)). The surfactant is here the anion of dodecanesulfonic add. 

The effect of cetyltrimethylammonium bromide on the rate constants of hydrolysis of ethyl glycinate hydrochloride has been reported. " Cationic and non-ionic micelles inhibited and anionic micelles accelerated the acid hydrolysis of A-p-tolyl-benzohydroxamic acid (189). The rates of acid hydrolysis of acetohydroxamic acid, MeCONHOH, benzohydroxamic acid, PhCONHOH, and A-phenylbenzohydroxamic acid, PhCON(OH)Ph, were increased by perfiuorooctanoic acid and by sodium 1-dodecanesulfonate and sodium dodecyl sulfate (SDS). " The effects of micelles of SDS upon the rates of reaction of ionized phenyl salicylate with Bu"NH2, piperidine and pyrroiidine have been reported. 

Bemdt, D.C., Pamment, M.G., Fernando, A.C.M., Zhang, X., Horton, W.R. Micellar kinetics in aqueous acetonitrile. Part A. Sodium-hydrogen ion-exchange constant for 1-dodecanesulfonate surfactant. Part B. Substrate structural effects for micellar catalysis by perfluorooctanoic acid as reactive counterion surfactant. Ira. J. Chem. Kinet. 1997, 29(10), 729-735. 

Dodecylbenzenesulfonate determination in presence of dodecylsulfate and dodecanesulfonate Silica Gel G with ammonium sulfate, 0.25 mm 20 6 1.6 1 MIBK/n-PrOH/0.1 M HOAC/CH3CN Phosphomolybdic acid 250 C for 15 min 6... 

An aqueous solution of the sample is prepared at about 0.001 M. Ten milliliters are added to a glass-stoppered conical flask, together with 10 mL acid mixed indicator solution, 0.235 mL concentrated H2SO4,15 mL CHCI3, and 5.0 mL 95% ethanol. Titrate with 0.001 M dodecanesulfonate solution, shaking vigorously after each addition of titrant. At the end point, the chloroform phase is light pink. 

---