Tris benzoic acids

A review by Galli et al. describes several buffer-absorbing chromophores as co-ions. These include phthalate, PDG (2,6-pyridinedicarboxylic acid), PMA (1,2,4,5-benzenetetra-carboxylic acid or pyromellitic acid), TMA (trimellitic acid), MES, 2,4-dihydrobenzoic acid with s-aminocaproic acid, p-hydroxybenzoate, p-anisate, 3,5-dinitrobenzoic acid, salicylic acid with TRIS, benzoic acid with tris (hydroxymethyl)aminomethane (TRIS), and many others. On the other hand, some inorganic chromophores such as chromate (Figure 9) or molybdate may be added to a buffer. A BGE-containing chromate should have a pH above 8, because it precipitates below this value. The advantage of a TRIS buffer or buffers at around pH 6 is that carbonate will not interfere with the separation because it is not soluble in TRIS or at lower pHs. 

Vapor-phase oxidation of toluene to produce benzoic acid and benzaldehyde has been tried utilizing several different catalysts, but yields are low and the process cannot compete with the Hquid-phase process (see Benzaldehyde). Other processes for the production of benzoic acid are presendy of htde commercial importance. 

The synthesis and characterization of tris-chelate Ir111 complexes of 2-(acetylamino)benzoic acid, 2-(benzoylamino)benzoic acid, 2-[(2-aminophenylamino)carbonyl]benzoic acid, maleanilic acid, malea-l-naphthalanilic acid, and 2-[(phenylamino)carbonyl]benzoic acid have been described.245... 

Buchanan and coworkers113c investigated the reaction of 2,3,5-tri-O-benzyl-D-ribofuranose with (ethoxycarbonylmethylene)triphenyl-phosphine in anhydrous 1,2-dimethoxyethane in the presence of a catalytic amount of benzoic acid. The alkenic products were isolated in high yield, and each was converted into an anomeric mix-... 

Figure 4. Spectral sensitivity data of PMMA and sensitized PMMA obtained by the equipment shown in Figure 3 (A) PMMA (B) PMMA -f- p-teit-butyl benzoic acid (C) PMMA + 2,4-di-tert-butylphenol (D) PMMA + 2,4,6-tri-teit-butyl-...

Figure 9. Spectral sensitivities of PMMA and sensitized PMMA ( ) PMMA (tH) PMMA + p-tert-bvtyl benzoic acid (A) PMMA -)- 2,4-di-tert-butylphenol (Q) PMMA -)- 2,4,6-tri-tert-butylphenol...

Notes ace, acetic acid oxa, oxalic acid mal, malonic acid sue, succinic acid mly, malic acid hba,/ -OH-benzoic acid gao, gallic (tri-OH-benzoyl) acid cum, / -coumaric acid caf, caffeic acid fer, ferulic acid sin, sinapic acid hca, 3,5-diOHcinnamic acid tar, tartaric acid ara, arabinose xyl, xylose rha, rhamnose gal, galactose glc, glucose glu, glucuronic acid 2-(xyl)glc, sambubiose 2-(xyl)gal, lathyrose 2-(rha)glc, neohesperidose 6-(rha)gal, robinose 6-(rha)glc, rutinose 2-(glc)glc, sophorose 3-(glc)glc, laminariobiose 6-(glc)glc, gentiobiose. 

The trimerization of cyclopentadiene (6) is catalyzed by a homogeneous bifunctional palladium-acid catalyst system.7 The reaction gives trimers 7 and 8 as a 1 1 mixture in 70% yield with bis(acetylacetonato)palladium(II) [Pd(acac)2] or with bis(benzylideneacetone)-palladium(O) as the palladium component of the catalyst. As the phosphorus component, phosphanes like trimethyl-, triethyl-, or triphenylphosphane, and triisopropylphosphite or tris(2-methylphcnyl)phosphite, are suitable. A third component, an organic acid with 3 < pK < 5, is necessary in at least equimolar amounts, in the reaction with cyclopentadiene (6), as catalytic amounts are insufficient. Acids that can be used are acetic acid, chloroacetic acid, benzoic acid, and 2,2-dimethylpropanoic acid. Stronger acids, e.g. trichloroacetic acid, result in the formation of poly(cyclopentadiene). The new catalyst system is able to almost completely suppress the competing Diels-Alder reaction, thus preventing the formation of dimeric cyclopentadiene, even at reaction temperatures between 100 and 130°C. 

It has been reported that a variety of single-chain amphiphiies spontaneously produce stable, membrane-forming aggregates when dispersed in water 258 260). Dialky 1-amphiphile l-III (l or d means l- or D-configuration of amino acid unit in compound III, respectively), which was prepared by condensation of didodecyl L-glutamate and p-(4-bromobutoxy)benzoic acid and the subsequent quarterization with tri-methylamine, produces bilayer vesicles in water as probed by electron microscopy 251 >. 

Aminoethylcellulose Perchlorate Vol l,p A204 R Cellulose Benzoates ate esters of cellulose benzoic acid. The mono- and di-benzoates were prepd by treating cellulose in alk soln with benzoyl chloride. Tri-benzoate was reported to have been prepd by the action of benzoyl chloride pyridine on cellulose at 110-30° in the presence of nitrobenzene. The prod is sol in chlf nitrobenz(Ref 6)... 

ML Puttemans, L Dryon, DL Massart. Extraction of organic acids by ion-pair formation with tri-n-octylamine. Part V. Simultaneous determination of synthetic dyes, benzoic acid, sorbic acid and saccharin in soft drinks and lemonade syrups. J Assoc Off Anal Chem 67(5) 880-885, 1984. 

Cobalt complexes find various applications as additives for polymers. Thus cobalt phthalocyanine acts as a smoke retardant for styrene polymers,31 and the same effect in poly(vinyl chloride) is achieved with Co(acac)2, Co(acac)3, Co203 and CoC03.5 Co(acac)2 in presence of triphenyl phosphite or tri(4-methyl-6- f-butylphenyl) phosphite has been found to act as an antioxidant for polyenes.29 Both cobalt acetate and cobalt naphthenate stabilize polyesters against degradation,73 and the cobalt complex of the benzoic acid derivative (12) (see Section 66.4) acts as an antioxidant for butadiene polymers.46 Stabilization of poly(vinyl chloride)-polybutadiene rubber blends against UV light is provided by cobalt dicyclohexyldithiophosphinate (19).74 Here again, the precise structure does not appear to be known. 

Similarly, the methyl ester fraction of the alkaline oxygen reaction contained the methyl esters of benzoic acid, the di-, tri-, and tetracarboxy-benzenes, and the methyl ether ester of vanillic acid. The methyl ether ester of syringic acid was also found. With regard to other acids reported... 

Fig. 3. Conductivity curves of the copolymerization of 2-hydroxy-4-(2,3-epoxypropoxy)benzophenone (0.5 mol/1) with phthalic anhydride (0.5 mol/1) in o-xylene at 120 °C initiated by various initiators.57) 1 — tri-n-hexylamine (0.025 mol/1) 2 - tri-n-hexylamine (0.025 mol/1) and cyclohexanol (0.025 mol je 1) 3 — tri-n-hexylamine (0.025 mol/1) and benzoic acid (0.025 mol/1) 4 — hexadecyltrimethyl-ammonium bromide (0.005 mol/1)...

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