Dodecane sulfonates

Sodium dodecane sulfonate Dodecyl triethylene glycol ether -3.2 -2.6... 

Sodium dodecane sulfonate A-Dodecyl-A-benzyl-A-methylglycine -6.9 -5.4... 

FIG. 35 The phase behavior of dodecane sulfonic acid with water. O, Doubly refracting material appears as the isotropic solution is cooled. <3, Isotropic solution appears as the liquid crystal is heated. CD, Crystalline solid disappears on heating. Pairs of solid points connected with the vertical dashed lines mark the appearance and disappearance of pseudoisotropy as samples are heated. The area ABC, within which the intermediate mesophase exists alone, is not precisely determined. 

Different results were obtained by Kobayashi and colleagues [76] performing the Diels-Alder reaction of 2,3-dimethyl butadiene with N-butylmaleimide in water in the presence of various dodecyl sulfate (DS) and dodecane sulfonate (DCS) LASCs [M(DS) M = Sc, Cu n = 3, 2 M(DCS) M = Sc, Yb, Mn, Co, Cu, Zn, Na, Ag n = 3,2, 1]. Unexpectedly, no acceleration was observed with respect to the reactions carried out in water only, and no catalytic effect was found also by using a bidentate dienophile which, in principle, should be able to coordinate the metal cation in the LASC system. 

A study using resuspended river sediment (Marchesi et al. 1991) illustrated the important interdependence of substrate attachment to particulate matter and its biodegradability. Addition of sodium dodecyl sulfate that is degradable resulted in a relative increase in the number of particle-associated bacteria, whereas this was not observed with the nondegrad-able analogs such as sodium tetradecyl sulfate or sodium dodecane sulfonate. 

A recent notable finding in this field is Mukaiyama aldol reactions in aqueous medium (THF H20 = 9 1) catalyzed by metal salts. Lewis acids based on Fe(II), Cu(II), and Zn(II), and those of some main group metals and lanthanides are stable in water. Remarkably, the aldol reaction shown in Sch. 29 occurs more rapidly than the hydrolysis of the silyl enol ether [137]. In the presence of surfactants (dodecyl sulfates or dodecane sulfonate salts), reactions of thioketene silyl acetals with benzaldehyde can be performed in water [138]. 

Surfactants used to characterize the main properties of the precipitate surface i.e. the specific surface area and heterogeneity are 1 sodium dodecane sulfonate-SDS (ref. Merck 12146) with a Krafft point of 31°C and solubility of 6.5T0 M [8] in water at 25°C and 1 sodium tetradecane sulfonate -STS (ref. Merck 12362) with a Krafft point of 46°C and solubility of 1.36T0 M [8] in water at 25°C. 

Tetrabutylammonium phosphate Tetramethylammonium hydrogen sulfate Cetyltrimethylammonium hydrogen sulfate Butane sulfonic acid Pentane sulfonic acid Hexane sulfonic acid Octane sulfonic acid Dodecane sulfonic acid 1-Pentane sulfonate, sodium 1-Octane sulfonate, sodium 1-Dodecyl sulfate, sodium... 

By modifying the synthetic process, the parent hydrocarbon can be sulfated to yield dodecane sulfonic acid, having a direct carbon-sulfur bond... 

Figure 35 Surfactant binding to BSA in 10 M NaCl (open symbols) and in 10 M NaCl (filled symbols). (A) SDS (O) sodium dodecane sulfonate ( ) octyl benzene sulfonate. (From Ref. 146.)...

Thin-layer chromatography is a rapid, inexpensive method for qualitative and quantitative analysis of mixtures of anionics. Table 1 shows several normal phase systems designed to separate particular surfactant mixtures. For example, LAS, dodecylsulfate, and dodecane-sulfonate are completely resolved with a MIBK/propanol/acetic acid/acetonitrile system (6). 

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