Tetradecyl trimethylammonium bromide

Bromomethylation of arenes using 1,3,5-trioxane and hydrobromic acid is catalysed by the addition of a phase-transfer catalyst. Yields in excess of 90% are attained using (tetradecyl)trimethylammonium bromide under relatively mild conditions for a range of arenes [55]. Tetra-n-butylammonium bromide is ineffective, suggesting the catalytic effect may be micellar. 

The effects of micelles of cetyltrimethylammonium bromide (CTABr), tetradecyl-trimethylammonium bromide (TTABr) and sodium dodecyl sulfate (SDS) on the rates of alkaline hydrolysis of securinine (223) were studied at a constant [HO ] (0.05 m). An increase in the total concentrations of CTABr, TTABr and SDS from 0.0 to 0.2 M causes a decrease in the observed pseudo-first-order rate constants (kobs) by factors of ca 2.5, 3, and 7, respectively. The observed data are explained in terms of pseudophase and pseudophase ion-exchange (PIE) models of micelles. Cationic micelles of CTABr speed attack of hydroxide ion upon coumarin (224) twofold owing to a concentration effect. ... 

Synonyms myristyltrimethylammonium bromide tetradecyl-trimethylammonium bromide N,N,N-trimethyl-l-tetra-decanaminium bromide. 

These are compounds that can be added to the electrolyte to alter the direction and rate of the electro-osmotic flow. Flow rate varies inversely with ionic strength and is independent of column diameter. The effect of pH between 2 and 12 and applied potential increase the electro-osmotic flow rate linearly. The flow can be reversed by adding quaternary amines, such as cetyltrimethylammonium bromide or tetradecyl-trimethylammonium bromide. Zero flow occurs when 5-benzyIthiouronium chloride is added to the buffer. Organic molecules such as methanol and putrescine reduce the flow, whereas acetonitrile increases the flow. Covalently bonded polyethylene glycol reduces the flow. 

Track-etched polycarbonate filters and hydrophilic cellulose membrane filters (both 0.2 micron pore diameter, Whatman Filter Co.) were used to recover supernatant solutions. Total chelating agent and metal ion-chelating agent complex concentrations were determined using a Quanta 4000E capillary electrophoresis instrument (Waters Corp.) and bare fused-silica capillaries (75 microns wide, 60 cm long. Polymicro Technol.). The capillary electrolyte consisted of 25 mM phosphate buffer (pH 7.0) and 0.5 mM tetradecyl trimethylammonium bromide (TTAB) electroosmotic flow modifier (see (29)). 

Ethoxylated methylcarboxylates Propoxyethoxy glyceryl sulfonate Alkylpropoxyethoxy sulfate as surfactant, xanthan, and a copolymer of acrylamide and sodium 2-acrylamido-2-methylpropane sulfonate Carboxymethylated ethoxylated surfactants (CME) Polyethylene oxide (PEG) as a sacrificial adsorbate Polyethylene glycols, propoxylated/ethoxylated alkyl sulfates Mixtures of sulfonates and nonionic alcohols Combination of lignosulfonates and fatty amines Alkyl xylene sulfonates, polyethoxylated alkyl phenols, octaethylene glycol mono n-decyl ether, and tetradecyl trimethyl ammonium chloride Anionic sodium dodecyl sulfate (SDS), cationic tetradecyl trimethyl ammonium chloride (TTAC), nonionic pentadecylethoxylated nonylphenol (NP-15), and nonionic octaethylene glycol N-dodecyl ether Dimethylalkylamine oxides as cosurfactants and viscosifiers (N-Dodecyl)trimethylammonium bromide Petrochemical sulfonate and propane sulfonate of an ethoxylated alcohol or phenol Petrochemical sulfonate and a-olefin sulfonate... 

FIG. 6.2 Calculated dependence of (a) the monomer concentration C and (b) the weight average aggregation number gw on the total surfactant concentration Ctot for decyl, dodecyl, tetradecyl, and cetyl trimethylammonium bromides in ethylene glycol solutions. (From Nagarajan, R. and Wang, C.-C., J. Colloid Interface Sci., 178, 471, 1996.)... 

Ultrasonic relaxations of tetradecyl- and hexadecyl-trimethylammonium bromide in the presence of n-pentanol are reported. Only one relaxation time is observed, assumed to be dissociation of n-pentanol from the micelle. The rate constant at zero concentration is 1.8xl0 s two orders of magnitude smaller than the value obtained for an ion of comparable size. 

This is a mixture consisting of tetradecyl ( 68%), dodecyl ( 22%) and hexadecyl ( 7%) trimethylammonium bromide. Solutions containing 0.1-1% cetrimide are used to dean skin, wounds and burns, in shampoos to remove scales of sebor-rhoea, and also in Cetavlon cream. 

SOS, SDeS, SDS, STS sodium octyl, decyl, dodecyl and tetradecyl sulfates DTAB, CTAB dodecyl and hexadecyl trimethylammonium bromides C12EO3 triethyleneglycol monododecylether. 

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