Dimethyl-dodecyl

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. 

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). 

Dimethyl-dodecyl- E2, 34 Dimethyl-(2,5-dimethyl-phenyl)- XII/1, 142 (2,2-Dimethyl-dodecylammoniono-propyloxy)-hydroxy-... 

Poly(styrol)-4-ylmethyl]-butyl-dimethyl- -chlorid (vemetztes) Elba, 1030 (N-Alkylier.) [Poly(styrol)-4-ylmethyl]-dimethyl-dodecyl- -chlorid E16a, 1030 (N-Alkylier.)... 

Figure 3.24 Experimental adsorption isotherms of nucleotides on ODS silica, (a) Nucleotides on ODS. 1, Guanosine 2 3 -cyclic monophosphate 2, adenosine 2 3 -cyclic monophosphate 3, adenosine monophosphate. Spherisorb ODS-2 100 mM phosphate buffer pH 7, 25° C. (b) 1, a-MSH 2, benzyl-dimethyl-dodecyl ammoniiun bromide (BDDAB) on Spherisorb ODS-2,25°C, eluted with 15% v/v aqueous methanol (—) or with 21% aqueous acetonitrile, 0.2% formic acid and 0.4% triethylamine, pH 7 (—). Reproduced mth permission from from J.-X. Huang and Cs. Horvath, ]. Chromatogr., 406 (1987) 275, (a) Fig. 6, (b) Fig. 7.

The solubilization of eumelanins has been attempted under a variety of conditions. Table IV summarizes the results obtained with some native melanins (300). A melanin is considered completely solubilized if the solution does not scatter light. So far only two approaches have been successful, one of which is based on treating the pigment with Solulene 100 (0.1 M solution of dimethyl- -dodecyl-n-undecyl ammonium hydroxide in toluene incubation for 2.5 hr at 75 C). Such solutions were used in the characterization and quantitative determination of melanins (124,301). The extinction coefficient (absorption at 400 nm) for hair melanin was of the order of 3000 Af" cm per indole unit, while that of melanoma melanin was only about 70% that of synthetic dopa melanin (124). The mechanism of the Solulene solubilization process is unknown, and degradation of the pigment cannot be excluded. Interestingly, full neutralization of the melanin solution in Solulene with acetic acid did not precipitate the pigment (302). 

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 ... 

Die leichte Decarboxylierung der Saure (108) bei 56° mit Piperidin zum Dimethyl-dodecyl-sulfoniumsalz erfolgt vermutlich fiber das energe-tisch relativ gttnstige S-Dodecyl-S-methyl-sulfonium-methylid (70). 

VDAC Vinylbenzyl dimethyl dodecyl ammonium chloride... 

See Distearyidimonium chloride Ammonium, dimethyl dodecyl octyl-, chloride. See Octyidodecyl dimethyl ammonium chloride... 

Dilauroyl peroxide. See Lauroyl peroxide Dilauryl acetyl dimonium chloride CAS 90283-04-8 129541-39-5 Synonyms Dodecanaminium, N-carboxymethyl-N,N-dimethyl-, dodecyl ester, chloride 1-Dodecanaminium, N-[2-(dodecyloxy)-2-oxyethyl]-N,N-dimethyl, chloride N-Dodecyl-N,N-dimethyl-N-(dodecyl acetate) ammonium chloride... 

Betaine lauryidimethylaminoacetate Dimethyl dodecyl betaine N,N-Dimethyldodecylbetaine N,N-Dimethyl-N-dodecylglycine Dimethyl lauryl betaine 1-Dodecanaminium, N-(carboxymethyl)-N,N-dimethyl-, hydroxide, inner salt Dodecyl betaine (Dodecyidimethylammonio) acetate Dodecyidimethyl betaine Glycine, dodecyidimethylbetaine Lauryl-N-betaine Lauryidimethylammonioacetate ... 

Ferraris et al. [165] chemically synthesized a processible, self-n-doped, poly(2-(2 -thienyl)3-(4-dimethyl dodecyl ammonium phenyl)thiophene triflate) using the monomer shown in Figure 1.27A. This polymer was reportedly soluble in N-methylpyrrolidone to a concentration of 53mg/mL. Similarly, the polymer was prepared electrochemically in tetramethyl ammonium trifluromethane sulfonate. The polymer prepared chemically and electrochemically exhibited reversible redox behaviour in the p- and n-doping regions. The presence of bound cations to the polymer backbone provides the ability to p- and n-... 

A. A. Moxey, D. C. Loveday, I. D. Brotherson, J. P. Ferraris, Synthesis and characterization of poly[2-(2-thienyl)3-(4-dimethyl dodecyl ammonium phenyl) thiophene triflate] a processahle, self n-dopahle polymer, Polymer Preprints American Chemical Society, Division of Polymer Chemistry) 1998, 39,137. 

Amine oxides constitute another important class of nonionic surfactants. Examples of these surfactants include dimethyl dodecyl amine oxide (DMDAO) and cocoamidopropyl dimethyl amine oxide (CAPAO). This type of surfactant is nonionic at pHs above its pK and cationic below that point. When functioning as a nonionic, amine oxides have many useful properties. They interact strongly with anionics, which can result in performance benefits. Amine oxides help to mitigate anionic surfactant irritation, act as foam stabilizers, and can also function to improve grease removal. 

An example of the amplitude- and phase-frequency characteristics of pressure oscillations inside a closed cell with excitation in the cell are presented in Fig. 8. The characteristics are obtained for parameters of the Langmuir isotherm and the diffusion eoefficient characteristic for the model surfactant dimethyl dodecyl phosphine oxide (E = 4.39-10 ° mol/cm, b = 1.7-10 cmVmol, D = 4-10 cm /s, [30]). The parameter co is here assumed to be negative. 

Chem. Descrip. Dimethyl dodecyl amine Ionic Nature Cationic... 

Chem. Descrip. N,N-Dimethyl dodecyl tetradecylamine Uses Chemical intermediate producing end prods, ind. quaternaries and amine oxides used in disinfectant and cosmetic applies. 

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