Tetraoctylammonium bromide

Cleavage of ethers, Dialkyl and alkyl aryl ethers are cleaved by 47% hydro-bromic acid in an aqueous organic solvent in the presence of an onium salt (hexadecyltributylphosphonium bromide, tetraoctylammonium bromide) that is completely soluble in the organic phase. Dialkyl ethers are converted into alkyl bromides (65-90% yield),whereas a phenol and an alkyl bromide are obtained from alkyl aryl ethers (85-90% yields). 

Tetramethylammonium bromide (or hydrogen sulfate) Tetraethylammonium bromide (or hydrogen sulfate) Tetrapropylammonlum bromide or hydrogen sulfate) Tetrabutylammonlum bromide (or phosphate, iodide) Tetrapentylammonium bromide Tetrahexylammonium bromide (or hydrogen sulfate) Tetraheptylammonlum bromide Tetraoctylammonium bromide Hexadecyltrimethyl ammonium hydroxide (or bromide, or hydrogen sulfate) Decamethylenebis (trlmethylammonium bromide)... 

In the coreduction of the corresponding two metal salts by tetraoctylammonium triethylhydroborate in THF, Pt/Ru (37) and Pt/Rh (13,38) bimetallic nanoparticles, stabilized by tetraoctylammonium bromide, were obtained. No metal borate was found in the product. 

The suspension is filtered through a 150-mL medium-porosity fritted Buchner funnel to collect the solid, crude nanoparticles. The filtrate should be colorless. The product is triturated with the following solvent combinations to remove the tetraoctylammonium bromide ... 

If a large amount of tetraoctylammonium bromide remains, the product is washed with 1 1 MeOH H2O followed by hexanes until only a small amount... 

Alkynes.10 Alkynes can be prepared by double dehydrobromination of pic-dibromides in petroleum ether by use of powdered KOH and catalytic amounts of a phase-transfer catalyst. Tetraoctylammonium bromide, 18-crown-6, or even Aliquat 336 are much more effective than more hydrophilic quarternary ammonium salts, such as tetrabutylammonium hydrogen sulfate, previously used (7, 354-355)." Isolated yields are 80-98%. Yields are generally lower when mc-dichlorides are used as the starting material. 

Reduction of halides and sulfonates.2 Sodium borohydride effects this reaction under phase-transfer conditions (aqueous C6H5CH3 or CH2C12). The more lipophilic salts hexadecyltributylphosphonium bromide or tetraoctylammonium bromide are the most effective catalysts. 

R = -CH3, -CmH2m+-, functional group, functional molecule (e.g., chiral, mesogenic, pro-mesogenic) TOAB = tetraoctylammonium bromide... 

Gold nanoparticles capped with tetraoctylammonium bromide (TOAB) in toluene were prepared using well-established routes.43 The resulting solution displays a red-wine color, and has a strong absorption peak around 530 nm.44 45... 

The gold nanorods were prepared using the photochemical method described in the literature [12]. In a typical preparation, 1.78 mg of tetraoctylammonium bromide... 

Dissolve hydrogen tetrachloroaurate trihydrate (1.00 g, 2.54 mmol) and tetraoctylammonium bromide (1.60 g, 2.93 mmol) in a degassed water/toluene mixture (50 mL/65 mL). 

APES - y-aminopropyllrielhoxysilane APTS - 3-animopropyltriethoxysilane ES - epoxy silane MA- maleic anhydride OMCTS - octamethylcycloethoxysiloxane PDMS - poly(dimethyl siloxane) TESPT -(bis)(triethoxysilylpropyl)- tetrasulfone TOAB - tetraoctylammonium bromide with HAuCh... 

The order of catalytic activity of the phase transfer agents (Pta) in the reaction is tetraoctylammonium bromide > tetrabutylammonium bromide > benzyltriethylam-monium chloride. 

Mobile phase MeCN pH 7.0 Titrisol phosphate buffer (Merck) water 440 60 500, containing 3.5 gfL tetraoctylammonium bromide... 

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