Benzene carboxylic acid

Another pathway takes place upon cyclization of hydrazides of benzene carboxylic acids in the presence of CuCl in an inert atmosphere in DMF. However, only the cyclization of hydrazide 76 (R = H) in conditions of copper catalysis makes it possible to isolate compound 77 (yield 20%). Other hydrazides of acetylenylbenzoic acids react to give a complex mixture of products (Scheme 132) (85IZV1367 85MI2). 

Benzoic acid (benzene carboxylic acid) is a white crystalline solid with a characteristic odor. It is slightly soluble in water and soluble in most common organic solvents. 

HPTLC NH, EtOH/NHj pH = 12(6/4) UV 254 nm Benzoic acid, Pthalic acid. Benzene carboxylic acid 29... 

Benzene carboxylic acid Calcium benzoate E213... 

Based on their chemical structure, the organic chemicals were divided into a number of categories alkanes, alkenes, amines, aromatic hydrocarbons, benzenes, carboxylic acids, halides, phenols, and sulfonic acid. Linear regression analysis has been applied using the method of least-squares fit. Each correlation required at least three datapoints, and the parameters chosen were important to ensure comparable experimental conditions. Most vital parameters in normalizing oxidation rate constants for QSAR analysis are the overall liquid volume used in the treatment system, the source of UV light, reactor type, specific data on substrate concentration, temperature, and pH of the solution during the experiment. 

Various anions and cations Benzene carboxylic acids Comparison of various benzene carboxylic acids eluants - [67]... 

Figure 38 Organometallic benzene carboxylic acid building blocks chromium tricarbonyl complexes [27a].

SYNS ACIDE BENZOIQUE (FRENCH) BENZENE-CARBOXYLIC ACID BENZENEFORMIC ACID BENZENEMETHANOIC ACID BENZOATE BENZOESAEURE (GERMAN) BENZOIC ACID (DOT)... 

The oxidation of methyl groups of aromatic compounds by CuO-NaOH has been found to be ineffective. Therefore, relatively large amounts of methyl-substituted phenolic and benzene carboxylic acids were isolated from the coal oxidation. 

In an excellent work by Reuter et al. (1983), serious shortcomings in the interpretation of previous oxidation data were demonstrated. They established that mild oxidation of stream humic substances produced large quantities of oxalic acid indicating stream humic substances to be predominantly aliphatic in nature, whereas strong or severe oxidation produced structures stabilized by a 4n -I- 2 overlapping 7r-electron system, attributed mainly to a series of benzene carboxylic acids. Structural interpretation based on the products of severe oxidation would lead one to falsely conclude a greater degree of aromaticity in stream humic substances than actually exists in the unoxidized material. 

Methyl red Dimethylamino-azo-benzene carboxylic acid 4.4r-6.3 red - yellow Rupp and Loose... 

Angove, M.J., Fernandes, M.B., and Ikbsan, J., The sorption of anthracene onto goethite and kaolinite in the presence of some benzene carboxylic acids, J. Colloid Interf. Sci., 247, 282, 2002. 

Benzoic Acid Benzene- Carboxylic Acid Carboxybenzene Dracyclic Acid ... 

The relative adsorption of type 1 isomers on silica is somewhat less clear-cut than on alumina. The lesser importance of sample delocalization on silica [see Eq. (10-5a) and related discussion] should make site chelation on silica less significant than on alumina. Thus the ortho- and para-nitrobenzaldehydes, methoxybenzaldehydes, or dichlorobenzenes are adsorbed on silica to about the same extent (9,20,22a). However, the or// o-dinitrobenzenes, fiuoronitrobenzenes, or chloronitrobenzenes are adsorbed more strongly on silica than are the para isomers (22a,23), suggesting the importance of site chelation.f The relative adsorption on silica of the isomeric methyl esters of the benzene carboxylic acids (51) seems to be controlled by site-chelation. In each case that isomer which has the greatest number of adjacent ester groups is more strongly adsorbed ... 

Benzoic acid (benzene-methanoic acid, benzene-formic acid, benzene-carboxylic acid, phenyl-carboxylic acid, carboxy-benzene) [65-85-0]... 

Fig. 4 Chemical structures of benzene carboxylic acid derivatives...

Terephthalic acid finds extensive application in the manufacture of synthetic polyester-type fibers (notably Dacron and Teiylene). Commercially, it is produced by the liquid phase oxidation of /j-xylene. Thermal disproportionation of the potassium salt of benzene carboxylic acid (obtained from benzene) in the presence of cadmium as a catalyst, followed by hydrolysis of the potassium terephthalate, is another potentially attractive route. 

Application of this technique to the identification of methyl esters of the organic acids obtained by the controlled oxidation of bituminous coal allowed the more volatile benzene carboxylic acid esters to be identified (Studier et al., 1978). These were esters of benzene tetracarboxylic acid, tere-phthalic acid, toluic acid, and benzoic acid. Decarboxylation of the total acid mixture was shown to afford benzene, toluene, Cj-benzenes (i.e., ethylbenzene or xylenes), Cj-benzenes, butylbenzenes, Cj-benzenes, Cybenzenes, naphthalene, methylnaphthalene, C2-naphthalene, biphenyl, methylbi-phenyl, C3-biphenyl, indane, methylindane, Cj-indane, phenanthrene, and fluorene. 

The S. chrysormllus enzyme displays dififerent activities in the presence of a number of different benzene carboxylic acids tested as substrates (Table 2). The value of the equilibrium constant of the adenylate formation reaction, was increased when substituents such as an amino-, hydroxyl-, or methyl-groups in the 4-position were present, compared with benzoic acid alone. The same substituents in the 3-position resulted in a less pronounced response of the enzyme, whereas substituents in the Z-position were... 

Ferric chloride p-bis(trichloromethyl)benzene Carboxylic acid halides from carboxylic acid esters... 

Benzene in kerosene - 47, 160 Benzene in methanol - 285 Benzene carbinol -823 Benzene carboxylic acid (see Benzoic acid) Benzenedisulfonic acid - 108, 156,184 Benzene hexachloride (Lindane) - 34, 229, 478,613, 658... 

---