Dodecyl amine

Ahphatic amine oxides behave as typical surfactants in aqueous solutions. Below the critical micelle concentration (CMC), dimethyl dodecyl amine oxide exists as single molecules. Above this concentration micellar (spherical) aggregates predorninate in solution. Ahphatic amine oxides are similar to other typical nonionic surfactants in that their CMC decreases with increasing temperature. 

Wetting times of /V,/V-dimethy1-/ -alkyl amine oxides as a function of the alkyl chain length show a minimum with dimethyl dodecyl amine oxide (Table 3). Foam generation of dimethyl-/ -alkylamine oxides solutions show a maximum when the alkyl group contains 14 carbons. 

The effect of added inorganic salts on the micellar properties of the nonionic and cationic forms of dimethyl dodecyl amine oxide has been deterrnined (2). 

However, when the temperature is increased to 120°C, the principal reaction is the elimination to olefin. The thermal decomposition of dimethyl dodecyl amine oxide at 125°C in a sealed system, as opposed to a vacuum used by Cope and others, produces 2-methyl-5-decyhsoxa2ohdine, dimethyl dodecyl amine, and olefin (23). The amine oxide oxidi2es XW-diaLkylhydroxylainine to the nitrone during the pyrolysis and is reduced to a tertiary amine in the process. 

Aliphatic phosphoric acid and phosphonic acid amides containing lipophilic groups were prepared and used as antimicrobial surfactants. For example, 100 g ethylmethanephosphonate chloride was added to a solution of 130 g dodecyl-amine and 72 g triethylamine in 500 ml anhydrous benzene at 20-30°C to give 192 g ethylmethanephosphonate N-dodecylamide [125]. 

A fascinating area is micellar autocatalysis reactions in which surfactant micelles catalyse the reaction by which the surfactant itself is synthesized. Thus synthesis of dimethyldoceylamino oxide (reaction between dimethyl dodecyl amine and H2O2) benefits from this strategy. Here an aqueous phase can be used and an organic solvent can be avoided. Synthesis of mesoporous molecular sieves benefit through micellar catalysis and silicate polymerization rates have been increased by a factor 2000 in the presence of cetyltrimethyl ammonium chloride (Rathman, 1996). 

The sulphosuccinamate surfactants CA540 (Allied Chemical, USA) and 845 (Cytec) both contain four dissociable groups, three carboxylate and one sulphonate. Both collectors contain impurities such as dodecyl amine, maleic acid derivative and residual alcohols. This may explain the quite strong frothing properties of these collectors. 

There is some doubt about the kinetics of the activation of hydrogen by cuprous acetate in the closely related solvent, pyridine. Wright, Weller, and Mills (34) have reported that the rate-law in this solvent (and in dodecyl-amine) is first-order in cuprous acetate, suggesting heterolytic splitting of hydrogen. On the other hand, Wilmarth (33) has observed a second-order dependence similar to that in quinoline. The reasons for this discrepancy and for the difference between pyridine and quinoline, if real, are not clear. 

DMPA dimethyl phosphoro dithioic acid anilofos, azamethiphos, azinphosmethyl, dimethoate, formothion, fosmethilan, malathion, methidathion, phentoate, phosmet, thiometon DMPCT dimethyl phosphoro chlorido thioate acephate, bromophos, cyanophos, etrimfos, famphur, fenthion, fenitrothion, iodofenphos, metacrifos, methamidophos, methyl parathion, pirimiphos, temephos, tolclofos Dodecyl amine chloride dodine Dodecyl chloride dodine... 

Poly(amidoamine)-(PAMAM-Starburst)-Monodendrons Among the first Starburst (Cascade) syntheses we performed in the early 1980s [83] involved partially masked (differentiated) initiator cores. For example dodecyl-amine, hydroxyalkyl amines or partially protected alkylene diamines were used as initiator cores and submitted to sequential (a) Michael addition with methyl acrylate followed by (b) reaction with an excess of ethylene diamine to give in situ branch cell construction in a divergent manner. The resulting products were core functionalized monodendrons as shown below ... 

With increasing dodecyl amine, the surface area of the catalyst and, hence, the conversion decreased, whereas the selectivities for formation of methacrylic acid and methacrolein increased. The increase in selectivity was ascribed to a reduction in lattice oxygen mobility in the dodecyl alcohol-modified materials, which decreased the amount of COx produced. 

Figure 9.20 is an example of dodecylamine in solution at a concentration of 4 X 10 molar as a frmction of pH. As the pH increases, we find a decrease in the cationic amine concentration, as a result of the hydrolysis reaction, llie critical micelle concentration (CMC) of the dodecyl amine (i.e., the concentration at which self-aggr ation occurs) is also given as a frmction of pH in Figure 9.20. Because the CMC is...

Pinnavaia et al. [69,72] prepared a hexagonally packed alumina through the neutral templating approach. In the presence of a polymer surfactant, (PEO)i3(PPO)3o(PEO)i3, an alumina with a d spacing of 63 A and a surface area of 420 m /g was obtained [72]. It was also mentioned that non-layered alumina can be synthesized using octyl or dodecyl amine as template and a neutral aluminum alkoxide precursor. 

Precipitation pHs calculated for different concentrations Ct of dodecyl amine are given in Table 2.6. 

Fig. 2.7. Species distribution diagram of dodecyl amine as a function of pH (total cone. = 5x10 mol/1).

Competition of the dissolved mineral species with similarly charged collector species for adsorption sites can result in the depression of mineral flotation. For example, in the case of flotation of apatite and calcite with oleate as collector, the floatability is usually lower in saturated mineral supernatants than in pure water (Fig. 4.27). This is partly due to the competition by dissolved species such as PsO and CO which are present in saturated apatite and calcite supernatants (10 to 10 mol/1) in concentrations close to that of the anionic oleate ions. Similar effects are also observed in the case of flotation of fluorite with dodecyl amine (Fig. 4.28). Floatability of fluorite in its saturated solution is lower than that in water. The concentration of dissolved Ca species in the fluorite saturated solution is about 10 " mol/1 and only when the amine concentration is higher than 10 mol/1, the flotation obtained in it is similar to that obtained in water. 

Fig. 4.28. Floatability of fluorite with dodecyl amine in 1—pure water 2—saturated fluorite supernatant. 4.3.2. Surface and bulk precipitation...

It is synthesised from dodecyl amine (6), cyanamide (7) and acetic acid. 

Effective dilational elasticity of n-octanoic acid ( ) and dodecyl amine hydrochloride ( ) at 200 Hz, measured with a capillary wave technique according to Lucassen Hansen (1966)... 

Lucassen Hansen (1966) were one of the first to investigate the damping of capillary waves of surfactant solutions. In Fig. 6.11 their results for n-octanoic acid in 0.005 N HCl and dodecyl amine hydrochloride, both nonionic surfactants, are shown in form of effective dilational elasticity as a fimction of concentration. 

Beilstein Handbook Reference) AI3-15083 Alamine 4 Amine 12 Amine BB 1-Aminododecane Armeen 12 Armeen 12D BRN 1633576 Dodecanamine 1-Dodecanamine Dodecyl-amine 1-Dodecyiamine EINECS 204-690-6 Farmin 20D HSDB 2645 Kemamine P690 Lauramine Laurinamine ... 

Die Reaktion wird hauptsachlich mit Oxiran, Methyl-oxiran, seltener mit 2,3-Dimethyl-bzw. Ethyl-oxiran durchgefiihrt und kann sowohl als Druckreaktion als auch unter Nor-maldruck ablaufcn. So erhalt man z. B. im Autoklaven unter 0,6-10 bar Oberdruck mit 3% Dimethyl-dodecyl-amin ( ) bzw. 3% 1,6-Diamino-hexan ( ) als Base folgende Ester ... 

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