Tetramethyl ammonium bromide

Tetraethyl ammonium bromide Tetramethyl ammonium bromide Triethanolamine Triethylamine... 

A cationic detergent is needed for acidic proteins and tetramethyl ammonium bromide, (CHj)4N%Br, (V-hexadecyl-pyridinium chloride, and cetyltrimethyl ammonium bromide are used. 

To demonstrate the influence of buffered and non-buffered solutions differential pulse polarograms of glycerol trinitrate and 2,4,6-trinitrotoluene, are shown in Fig.5 and 6 respectively. The electrolytes are 60 % methanol solution with 0.1 M ammonium acetate (buffered solution) and 0.1 M tetramethyl ammonium bromide (non-buffered solution) electrolytes. 

Fig. 12. Differential pulse polarogram of 0.2 mM glycerol trinitrate, 0.67 mM nitroguanidine and 0.04 mM dibutylphthalate in 20 % methanol solution, using 0.1 M tetramethyl ammonium bromide electrolyte.

In this technique, two types of reactants are placed separately in two immiscible solvents, one of which is water. Polymerisation takes place at the interface in the presence or absence of a phase transfer catalyst (PTC) such cetyl tributyl ammonium bromide (CTAB), benzyl dimethyl hexadecyl ammonium chloride (BDMHDAC), tetramethyl ammonium bromide or tetraphenyl phosphonium bromide. This process is carried out by agitation or under static conditions. This technique is effective for condensation polymers or for the formation of polyaniline nanofibre. The advantages of the interfacial polymerisation technique include the use of simple equipment, nfild reaction conditions and flexibility in the ratio or purity of reac-... 

Procedure, Dissolve the polyester in benzene and shake with 1 n potassium hydroxide (aqueous) at room temperature. Then neutralize the water phase with sulphuric acid, and add the sample to a supporting electrolyte, consisting of 0-05 n sulphuric acid and 0-2 n tetramethyl-ammonium bromide, and measure the current at —0-40 V and —0-90 V. 

Figure 6 Rf values of 2- ubstituted benzoic acids in different solvents. The solvent composition organic componentAvater (40 60 v/v) with addition of 0.1 M tetramethyl ammonium bromide (pK value in parentheses) O, tenzoic acid (4,19) , 2-hydroxy (2,97) , 2-acetoxy (3.5) , 2-carboxy (2.91/5.59) , 2-nitro (2.16) , 2-methyl (3.91) A, 2-amino (6.97) T, 2-chloro (2.92). (From Ref. 162, by permission of Friedr. Viewig and Sohn.)...

The following chemicals were used as received (from Aldrich unless otherwise noted) 2,6-diaminoanthraquinone, 2,5-dichloro-p-phenylenediamine, 2,6-diamino-5-nitropyrimidine, 2,3,5,6-tetra-methyl phenylenediamine, 2,6-diamino-8-purinol hemisulfate monohydrate, adenine (Chemalog Chemical Dynamics Corp.), 1,9-diamino-nonane, 4,4 -diaminodiphenyl sulfon (Fluka AG), 4,4 -methylene-dianiline, tetraphenyl phosphonium iodide, tetrabutyl ammonium iodide, tetramethyl ammonium bromide, dibenzo-l8-crown-6, 15-crown-5, triphenylantimony dichloride and triethylamine (Eastman Kodak Co.). 

LC-UVA, C18 column at 40 °C with gradient H20 MeCN containing 50 mM NaC104and 5 mM tetramethyl ammonium bromide pH 3.0 as mobile phase LC-UVA, C18 column with Me0H H20 as mobile phase for hydroxybenzoates and MeCNxitrate phosphate buffer pH 3.0 for sodium dehydroacetate... 

Alkyl bromides have been converted into the corresponding iodides by treatment under solid solid liquid triphase conditions with silica-impregnated tetramethyl-ammonium salts (cf. ester formation, Section 3.4) [40]. 

Hyamin lOX (benzyl-N,N-dimethyl-N-[4-(l,l,3,3-tetramethyl-butyl)-phenoxyethyl]-ammonium bromide) 492.5 c... 

Arsenic triiodide also dissolves, the saturated solution at 15° C. having density 3-661. Other soluble halides are potassium bromide, anhydrous ferric and aluminium chlorides 6 and tetramethyl ammonium iodide but the iodides of rubidium, cadmium, manganese and cobalt, also mercuric and stannic iodides, and cobalt and stannic bromides, are insoluble or only very slightly soluble in arsenic tribromide. The liquid also dissolves phosphoryl bromide and, very slightly, ammonium thiocyanate. In the mixed solutions of halides, the components may react chemically (cf. p. 106), but such is not always the case for example, with antimony tribromide a continuous series of solid solutions is formed.7... 

Triphenyl Telluronium Triboranate-82 1.00 g (2.3 mmol) of triphenyl telluronium bromide are dissolved in 100 ml of water and 0.26 g (2.2 mmol) of tetramethyl ammonium triboranate-8 are dissolved in 50 ml of water. The two solutions are cooled to 0 and mixed. The precipitate is filtered off, washed under nitrogen with diethyl ether, and dried in a stream of nitrogen yield 0.83 g (95%) m.p. 57° (dec ). 

NCE = normal (1M KC1) calomel electrode, TMA = tetramethyl ammonium, TEA = tetraethyl ammonium, TPA = tetrapropyl ammonium, TBA = tetrabutylammonium, N = nitrate, B = bromide,... 

Most of the work is done with carbonyl complexes of group-VIA metals. Tungsten hexacarbonyl reacts at RT with methyllithium in solvents such as diethylether or THF almost quantitatively with addition of the carbanion to the carbon atom of a coordinated CO to give the lithium salt of acetylpentacarbonyl tungstate. This complex can be converted by aqueous tetramethylammonium bromide into the more stable tetramethyl-ammonium salt ... 

Singh and coworkers examined the effect of polarization energy on computed relative solvation free energies of ions as well. The calculated solvation free energies with and without polarization and experimental values for the mutations of ammonium ion to tetramethyl ammonium ion, chloride ion to bromide ion and sodium ion to potassium ion were -23.56 kcal/mol, -29.82 kcal/mol, -31.70 kcal/mol, -1.95 kcal/mol, -3.23 kcal/mol, -3.33 kcal/mol, -24.66 kcal/mol, -20.09 kcal/mol, and -17.05 kcal/mol, respectively. Therefore, polarization energy added a constant positive value to the free energy change for all the transformations except for the mutation of sodium ion to potassium ion. 

Although several systems have been evaluated to determine the structure of the ring formed in cyclopolymerization, very little work has been reported on the original cyclopolymer reported by Butler ( 7) that was obtained from N,N-dimethyldiallyl-ammonium bromide or the chloride. Consequently, we undertook a study of a five-membered quaternary ammonium polymer, poly(l,l, 3,4-tetramethyl-3-pyrrolinium bromide) as a model system. N,N-dimethyl-3,4-dimethylenepyrrolidinium bromide (6 ) was prepared by reacting dimethylamine with 2,3-bis(bromomethyl)-l,3-butadiene (5). In addition to the bromide salt (6), the iodide salt was also prepared by reacting 2,3-bis(bromomethyl)-l,3-butadiene... 

MCM-41 and Mo containing MCM-41 materials were synthesized under hydrothermal conditions at 388 K in a static stainless steel autoclave. In a typical synthesis of Mo-MCM-41, to a 25% aqueous solution of cetyltrimethyl ammonium bromide (CTAB) (S.D.Fine Chem.) 4gms. of 10% aqueous tetramethyl ammonium hydroxide (TMAOH) (S.D.Fine Chem.) was... 

The mesoporous silicoaluminophosphate materials were synthesized using cetyl tiimethyl ammonium bromide (CTAB) (99% S.D. Fine Chemicals) as structure directing agent. In a typical synthesis procedure, 8 gms. of aluminium isopropoxide (Loba Chemie) was mixed with dilute phosphoric acid (6.2 ml. H3PO4 in 60 ml H2O) and stirred vigorously for 1 hr at 333 K. This was followed by the addition of CTAB (8 gm in 20 ml H2O) with subsequent addition of appropriate amount of tetraethyl orthosilicate (TEOS) (Merck) in tetramethyl ammonium hydroxide. The pH of the resulting gel was around 2.5. The molar composition of the resulting gel thus obtained was ... 

TBACl tetrabutyl ammonium chloride manufactured by Aldrich TBACI-S tetrabutyl ammonium chloride manufactured by Sachem MTBCl methyltributyl ammonium chloride manufactured by Sachem TMCl tetramethyl ammonium chloride manufactured by Sachem ° TBABr tetrabut ammonium bromide manufactured by Sachem... 

Ammonium, tetramethyl-, bromide. See Tetramethylammonium bromide Ammonium, tetramethyl-, hydroxide. See Tetramethylammonium hydroxide Ammonium, tetramethyl-, iodide. See Tetramethyl ammonium iodide Ammonium, tetrapropyl-, bromide. See Tetrapropyl ammonium bromide Ammonium, tetrapropyl-, iodide. See Tetrapropyl ammonium iodide Ammonium thiocyanate CAS 1762-95-4 EINECS/ELINCS 217-175-6 UN 9092 (DOT)... 

Benzyl trimethyl ammonium hydroxide Cetrimonium bromide Dimethyl diallyl ammonium chloride Laurtrimonium bromide Laurtrimonium chloride Methyl tributyl ammonium chloride Tetrabutyl ammonium bromide Tetrabutyl ammonium chloride Tetrabutyl ammonium fluoride Tetra-n-butyl ammonium hydrogen sulfate Tetra-n-butyl ammonium hydroxide Tetrabutyl ammonium iodide Tetrabutylphosphonium acetate, monoacetic acid Tetrabutylphosphonium bromide Tetrabutylphosphonium chloride Tetraethylammonium bromide Tetraethylammonium hydroxide Tetrakis (hydroxymethyl) phosphonium chloride Tetramethylammonium bromide Tetramethylammonium chloride Tetramethylammonium hydroxide Tetramethyl ammonium iodide Tetraphenyl phosphonium bromide Tetrapropyl ammonium bromide Tetrapropyl ammonium iodide Tributylamine Tributyl phosphine Tributyl (tetradecyl) phosphonium chloride Trioctyl (octadecyl) phosphonium iodide catalyst, phase-transfer Tetraethylammonium chloride Tetraoctylphosphonium bromide Tri-n-butyl methyl ammonium chloride Tri methyl phenyl ammonium hydroxide catalyst, phenolics Triethylamine... 

With alkahne corrosive, TMAH (tetramethyl-ammonium hydroxide, in vitro it required 17 times more water than DIPHOTERINE solution to achieve pH normalization [243]. In an in vitro MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphen-yltetrazolium bromide) cell toxicity assay, 2/3 of cell remained viable after DIPHOTERINE solution washing compared with only 1/3 of cells which remained viable after water washing [243]. 

Tetrabutyl Tetraphenyl Tetramethyl Ammonium Phosphonium Ammonium Iodide Iodide Bromide... 

We conducted a C NMR study (9) of a 6-membered quaternary ammonium monomer model, a 5-membered quaternary ammonium model (a hydrogen reduced derivative of N,N,3,4-tetramethyl-3-pyrroli-dinium bromide) and poly(N,N-dimethyldiallylammonium chloride). The spectral data indicated that poly(N,N-dimethyldiallylammon-ium chloride) is composed of 5-membered rings rather than the 6-membered system. A similar study was carried out by Lancaster et. al. (13) and analogous results were obtained. 

---