Dimethylammonium bromide

A -Benzyl-A -methylephedrinium bromide [benzyl(2-hydroxy-l-methyl-2-phenethyl) dimethylammonium bromide] [58648-09-2] M 350.3, m 209-211 , 212-214 , [al -3.8 (c... 

X.H. Chen, H. Xie, J.L. Kong, and J.Q. Deng, Characterization for didodecy, 1-dimethylammonium bromide liquid crystal film entrapping catalase with enhanced direct electron transfer rate. Biosens. Bioelectron. 16, 115-120 (2001). 

Decamethylene-(3-hydroxyquinuclidinium Bromide)[(2-Dimethylcarbamoxyethyl)dimethylammonium Bromide] C02-A013... 

Dotnahska, U. and Bogel-Lukasik, R. Physicochemical properties and solubility of alkyl-(2-hydroxyethyl)dimethylammonium bromide, J. Phys. Chem. B, 109(24) 12124-12132, 2005. 

Similar to the imidazolium ILs, very low solubility of the ammonium ILs was observed in alkanes. Eor example, the solubility of butyl(2-hydroxyethyl) dimethylammonium bromide, [(Ci)2C4HOC2N]Br, exhibited a simple eutectic system with immiscibility in the liquid phase in the IL mole fraction range from XjL = 0.02 to 0.70 [53] the other ammonium salt, (benzyl)dimethyl-alkylammonium nitrate, [Be(Ci)2C N] [NOJ showed very small solubility in the liquid phase in hexadecane and it was slightly better in hexane (immiscibility from XjL = 10 to 0.90) [99] for the ammonium salt with an alkane substituent only, didecyldimethylammonium nitrate, [(Cio)2(Q)2N][N03], the solubility in the liquid phase was better in hexane (immiscibility from XjL = 10 to 0.50) than in hexadecane, where the immiscibility was observed in the whole IL mole frachon [100]. In all systems with imidazolium and ammonium salts, an increase in the alkyl chain length of the alkane (solvent) resulted in a decrease of solubility. 

Investigation of thermodynamic behavior of monolayers formed from mixtures of bis[2-(n-hexadecanoyl)ethyl]methyl(4-vinylbenzyl) ammonium chloride (1) and dioctadecyl-dimethylammonium bromide (5) serves as the second example [116]. The determined surface-pressure/surface-area isotherms of mono-layers prepared from (1) and (5) and from their mixtures are given in Fig. 8. The isotherms showed the expected behavior following the liquid state there was a transition to the solid state in the region of 20-36 mNm 1. This transition was characterized by a pressure, and by a corresponding area, Aj. All isotherms intersected in the vicinity of 30 mNm-1 and, at surface-pressure/surface-area... 

Later, similar experiments were made for cationic networks of polyfdiallyl-dimethylammonium bromide) in the presence of sodium dodecyl sulfate or potassium salts of carboxylic acids with different lengths of hydrocarbon groups [66-68]. 

Cationic surfactants with an electron rich phenyl substituent on the hydrophilic ammonium head group (phenyl, 2,4-dimethoxyphenyl, and 2,4-dimethoxybenzyl dimethylammonium bromides) were found to be more efficient catalysts than CTAB for the hydrolysis of 2,4- and 2,6-dinitrophenyl phosphates (Bunton et al., 1970). The pseudo-first order rate constants increased appreciably at low concentrations of these... 

This ester-type anesthetic is a combination of tetracaine HCl (2%), butyl aminobenzoate (2%), and benzocaine (14%). Benzalkonium chloride and cetyl dimethylammonium bromide are included as surface-active agents to facilitate the passage of benzocaine into the mucosal tissues. 

Up until 1977, the non-covalent polymeric assemblies found in biological membranes rarely attracted any interest in supramolecular organic chemistry. Pure phospholipids and glycolipids were only synthesized for biophysical chemists who required pure preparations of uniform vesicles, in order to investigate phase transitions, membrane stability and leakiness, and some other physical properties. Only very few attempts were made to deviate from natural membrane lipids and to develop defined artificial membrane systems. In 1977, T. Kunitake published a paper on A Totally Synthetic Bilayer Membrane in which didodecyl dimethylammonium bromide was shown to form stable vesicles. This opened the way to simple and modifiable membrane structures. Since then, organic chemists have prepared numerous monolayer and bilayer membrane structures with hitherto unknown properties and coupled them with redox-active dyes, porous domains and chiral surfaces. Recently, fluid bilayers found in spherical vesicles have also been complemented by crystalline mono-... 

Okamoto and Attarwala [159] brought an improvement to the reaction of Severin, by adding a cationic surfactant (as a phase transfer catalyst) to the reaction medium. They examined the reduction of unsymmetrically substituted -2,4,5- and 2,3,4-trinitrotoluenes by sodium borohydride in methylene dichloride at 23-24 C in the atmosphere of nitrogen in the presence of ethylhexadecyl-dimethylammonium bromide. 

Fig. 5-44. Separation of a didodecyl-dimethylammonium bromide. -Separator column IonPac NS1 (10 pm) eluent (A) 0.02 mol/L HC1 / acetonitrile (25 75 v/v) flow rate 1 mL/min detection suppressed conductivity injection volume 50 pL solute concentration 300 ppm.

Okuyama, K., Soboi, Y, lijima, N., Hirabayashi, K., Kunitake, T., Kajiyama, T. (1988). Molecular and crystal structure of the lipid-model amphiphUe, dioctadecyl-dimethylammonium bromide monohydrate. Bull. Chem. Soc. Jpn., 61 1485. 

Trade Name Synonyms Emalex CWS-5 [Nihon Emulsion http //www.nihon-emuision.co.jp] Cetethyidimonium bromide CAS 124-03-8 EINECS/ELINCS 204-672-8 Synonyms Ammonium, ethylhexadecyidimethyl-, bromide CDA Cetyl dimethylethyl ammonium bromide Cetyl ethyl dimethylammonium bromide Dimethyl ethyl hexadecyl ammonium bromide... 

Cetyl esters wax. See Cetyl esters Cetyl ethyl dimethylammonium bromide. See Cetethyldimonium bromide Cetyl 2-ethyl hexanoate. See Cetyl octanoate Cetyl ethyl morpholinium ethosulfate N-Cetyl ethylmorpholinium ethosulfate N-Cetyl-N-ethyl morpholinium ethyl sulfate. See Cetethyl morpholinium ethosulfate Cetyl gallate... 

The produced quinone makes black complexes within the original hydroquinone very easily. As shown in Figure 4.48, when the crystals of hydroquinone and quinone are placed separately, the dark-violet crystals of the complex, which are called quinhydron, appear between the two crystalline samples. We tried to stabilize hydroquinone by making complexes with various surfactant molecules containing quaternary ammonium salts, such as alkyltrimethylammonium halides, benzyl(alkyl)dimethyl-ammonium chloride, and ethyl(hexadecyl)dimethylammonium bromide (ECDAB). After many trials, complex crystals suitable for X-ray analysis were formed with benzyl(hexadecyl)dimethylammonium chloride (BCDAC) and ECDAB, as shown in Figure 4.49. 

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