Tetrabutyl phosphonium bromide

Another method involved a reaction of 8-chlorotheophylline with an excess of phenyl or aryl glycidyl ethers, or epichlorohydrin in the presence of tetrabutyl-phosphonium bromide as a phase-transfer catalyst in diglyme at 90 °C to produce 43 (92TL6307). Also, oxiranes and their precursors such as compounds of 3-halogenopropane-l,2-diol type can be employed with 8-halogenoxanthine (65MI1). 

Hydroformylation [HRu3(CO)u]T [HRu3(CO)ii(D1PHOS)] Olefines [TBUP][Br] (tetrabutyl-phosphonium-bromide 96,96a... 

A more detailed study into the mechanism of ruthenium bimetallic melt catalysis for alcohol/ester production has been undertaken for the ruthenium-cobalt combination. Specifically, for the triruthenium dodecacarbonyl-dicobalt octacarbonyl couple, dispersed in tetrabutyl-phosphonium bromide, we have defined the experimental limits of this catalysis, demonstrated multiple catalyst recycle (7) and most importantly, identified some of the relationships linking catalyst productivity, alcohol-ester carbon distributions, and certain key operating parameters with the catalytically active metal carbonyl species present in these reaction media. 

Solution Spectra. The typical crude product solutions from these triruthenium dodecacarbonyl-dicobalt octacarbonyl/tetrabutyl-phosphonium bromide catalyzed CO hydrogenations to Ci C alcohols and their acetate esters display three band sets in the metal carbonyl spectral region. The strong band at ca. 1888 cm is characteristic (57) of [Co(C0)4l. The group of bands at 1955, 1990, and 2017 cm is characteristic (32) of the hydridoruthenium carbonyl anion,... 

In some instances, to circumvent the problem of low solubility of most organic substrates in water, surfactants (sodium dodecyl sulfate, cetyl trimethyl ammonium bromide, tetrabutyl phosphonium bromide) are added to the catal3dic medium (351). 

While a number of different phase transfer catalysts such as tetrabutyl ammonium halides (Ref. 10, 11), tetrabutyl ammonium hydroxide (Ref. 16-18), tetrabutyl ammonium hydrogen sulfate (Ref. 21-22), Adogen-464 (Ref. 16, 18), tetrabutyl phosphonium bromide (Ref. 19, 20), 18-crown-6 (Ref. 12, 13, 19, 20), cryptand [222] (Ref. 21, 22), etc., have been used in the chemical modification of polymers, few systematic studies of the influence of the catalyst on the reactions have been done. It is presumed that the same considerations which govern the choice of a phase transfer catalyst for classical organic synthesis also apply in the case of reactions with polymers. 

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... 

Phosphonium, tetrabutyl-, bromide. See Tetrabutylphosphonium bromide Phosphonium, tetrabutyl-, chloride. See Tetrabutylphosphonium chloride Phosphonium, tetrakis (hydroxymethyl)-, sulfate (2 1). See Tetrakis (hydroxymethyl) phosphonium sulfate... 

Uses Phase transfer catalyst, polymerization catalyst, chemical intermediate Manuf./Distrib. Cytec Ind. http //www.cytec.com Tetrabutylphosphonium bromide CAS 3115-68-2 EINECS/ELINCS 221-487-8 Synonyms Phosphonium, tetrabutyl-, bromide Tetra-N-butylphosphonium bromide Empirical CieHseBrP Formula (n-C4Hg)4PBr... 

Tetra-N-butylphosphonium bromide. See Tetrabutylphosphonium bromide Tetrabutylphosphonium chloride CAS 2304-30-5 EINECS/ELINCS 218-964-8 Synonyms Phosphonium, tetrabutyl-, chloride Empirical CisHseCIP Formula (n-C4Hg)4PCI... 

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.). 

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

---