ChemInform Abstract: Catalytic Hydroxylation of Benzoic Acid with Hydrogen Peroxide.

ChemInform ◽  
2010 ◽  
Vol 23 (49) ◽  
pp. no-no
Author(s):  
E. A. KARAKHANOV ◽  
CH. RETISH PULIPPURASSERIL ◽  
T. YU. FILIPPOVA ◽  
S. V. EGAZAR'YANTS ◽  
A. G. DEDOV
Keyword(s):  
Hydrogen Peroxide ◽  
Benzoic Acid

Oxidation of Benzaldehyde to Benzoic Acid with Aqueous Hydrogen Peroxide over Dodecatungstophosphoric Acid

2013 ◽  
Vol 781-784 ◽  
pp. 219-222
Author(s):  
Qiu Ying Huang ◽  
Bei Bei Dong ◽  
Xiu Cheng Zheng
Keyword(s):  
Hydrogen Peroxide ◽  
Benzoic Acid ◽  
Catalytic Reaction ◽  
Type Structure ◽  
Optimal Parameters ◽  
Reaction Parameters ◽  
Aqueous Hydrogen Peroxide ◽  
Reaction Conditions ◽  
Prepared Sample ◽  
Keggin Type

Dodecatungstophosphoric acid was synthesized and used as catalyst for oxidation of benzaldehyde to benzoic acid with aqueous hydrogen peroxide. The effect of various catalytic reaction parameters including time, temperatures, and the amount of catalyst on the yield of benzoic acid was investigated in details. The results indicated that the as-prepared sample was in the keggin-type structure and the optimal parameters under the reaction conditions were as follows: 0.5 g of catalyst, reacted at 80 C for 5 h.

Metalloporphyrin catalytic oxidations of hydrocarbons by H2O2

2000 ◽  
Vol 04 (06) ◽  
pp. 599-604 ◽  
Author(s):  
ANTÓNIO M. d'A. ROCHA GONSALVES ◽  
ARMÉNIO C. SERRA
Keyword(s):  
Hydrogen Peroxide ◽  
Benzoic Acid ◽  
Catalytic Oxidation ◽  
Phase System ◽  
Two Phase ◽  
Catalytic Oxidations ◽  
Oxidation Of Hydrocarbons ◽  
Oxygen Donor ◽  
Catalyst Efficiency

The metalloporphyrin catalytic oxidation of hydrocarbons using dilute hydrogen peroxide as oxygen donor with a two-phase system in the presence of an excess of benzoic acid is studied. Porphyrins derived from meso-tetrakis(2,6-dichlorophenyl)porphyrin and bearing sulfonamide substituents at β or meso positions and halogens at β positions were used. The system allowed for very efficient catalytic epoxidations and hydroxylations of hydrocarbons. It is proved that the excess of benzoic acid is critical to the catalyst efficiency and stability. The role of the lipophilic acid in this system is discussed.

Cool flames in the combustion of toluene and ethylbenzene

1956 ◽  
Vol 238 (1213) ◽  
pp. 143-153 ◽  
Keyword(s):  
Hydrogen Peroxide ◽  
Light Intensity ◽  
Benzoic Acid ◽  
Aromatic Compounds ◽  
Flow System ◽  
Reaction Vessel ◽  
Static System ◽  
Cool Flame ◽  
Cool Flames ◽  
Blue Flame

The oxidation of toluene and ethylbenzene has been studied in a static system using a spherical reaction vessel (700 ml.) over the temperature range 300 to 500°C, and at total pressures up to 600 mm. Cool flames were observed in the oxidation of both hydrocarbons, but only the reaction of ethylbenzene gave rise to a ‘blue’ flame at higher temperatures. With neither hydrocarbon did periodicity in light intensity, or pressure pulses, occur. The ignition diagrams for 4 to 1 fuel + oxygen mixtures have been mapped out. With ethyl­benzene, the cool flame was maintained in a flow system, its spectrum was photographed and shown to be similar to that of fluorescent formaldehyde. The products of the reaction con­tained acetophenone, benzaldehyde and benzoic acid, phenol, quinol, hydrogen peroxide and methoxyhydroperoxide. The results have been compared with corresponding data for the oxidation of paraffin hydrocarbons, and it is concluded that, with both aromatic compounds, the processes allowing the possibility of cool-flame formation are themselves secondary in nature.

Synthesis and Characterization of New Dibenzo[b, e]Thiepine Derivatives. I

2009 ◽  
Vol 59 (12) ◽  
Author(s):  
Camelia Elena Stecoza ◽  
Miron Teodor Caproiu ◽  
Constantin Draghici ◽  
Corina Ilie ◽  
Ileana Cornelia Chirita
Keyword(s):  
Hydrogen Peroxide ◽  
Spectral Analysis ◽  
Benzoic Acid ◽  
Potassium Salt ◽  
Polyphosphoric Acid ◽  
Chemical Characterization ◽  
Synthesis And Characterization ◽  
Acid Chlorides ◽  
New Compounds

The aim of the present paper was the synthesis and chemical characterization of some original compounds with dibenzo[b,e]thiepine structure. The synthesis of the new compounds was performed in several stages. Thus, by reaction of phtalide with thiophenol potassium salt, we obtained the 2-phenylthiomethyl-benzoic acid. The acid was cyclized with polyphosphoric acid to the desired 6,11-dihydrodibenzo[b,e]thiepin-11(6H)-one, converted afterwards to the corresponding oxime and subsequently to the O-acyloximino-dibenzo[b,e]thiepins by acylation with various substituted benzoic acid chlorides. The oxidation of O-acyloximino-dibenzo[b,e]thiepins with hydrogen peroxide afforded the corresponding sulfones. The new compounds, four O-acyl-oximino-dibenzo[b,e]thiepins, and four O-acyl-oximino-dibenzo[b,e]thiepin-5,5-dioxides, have been characterized by their physical constants (melting point, solubility) and their structures and purity were confirmed by elemental analysis, and spectral analysis (IR, 1H-NMR, 13C-NMR).

Catalytic oxidation of benzoic acid in acetic acid: Aromatic hydroxylation with in situ-generated hydrogen peroxide

1991 ◽  
Vol 69 (2) ◽  
pp. 215-222 ◽  
Author(s):  
Akikazu Itoh ◽  
Yasushi Kuroda ◽  
Tomoyuki Kitano ◽  
Guo Zhi-Hu ◽  
Atsutaka Kunai ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Benzoic Acid ◽  
Catalytic Oxidation ◽  
Aromatic Hydroxylation

scholarly journals Photodegradation Kinetics and Color Removal of 2-(4-hydroxyphenylazo) Benzoic Acid by Advanced Oxidation Processes

2021 ◽  
pp. 40-49
Author(s):  
Yeliz Karaman ◽  
Emine Baltaci
Keyword(s):  
Hydrogen Peroxide ◽  
Benzoic Acid ◽  
Sodium Hypochlorite ◽  
Ultraviolet Irradiation ◽  
Azo Dye ◽  
Ph Value ◽  
Degradation Kinetics ◽  
Experimental Studies ◽  
Color Removal ◽  
Optimum Ph

Degradation kinetics and color removal of 2-(4-hydroxyphenylazo)benzoic acid azo dye by the hydrogen peroxide/ultraviolet irradiation and sodium hypochlorite/ultraviolet irradiation processes were carried out in Spectroline CM-10A Model ENF-260C/FE photoreactor which has ultraviolet lamps irradiating at 254 and 365 nm wavelengths. All experimental studies were performed at room temperature in 0.04 M Britton Robinson buffer (pH 2-12). For this purpose, the degradation kinetics of 2-(4-hydroxyphenylazo)benzoic acid was investigated depending on pH, initial dye concentration and hydrogen peroxide concentration. Optimum pH and hydrogen peroxide concentration were determined as pH 10 and 3.57x10-2 M, respectively, for 3.5x10-5 M 2-(4-hydroxyphenylazo)benzoic acid. Optimum pH value in 1.55x10-3 M sodium hypochlorite medium has been found as pH 8 for 3.5x10-5 M azo dye. These methods used for degradation of dye are compared, it is concluded that sodium hypochlorite/ultraviolet irradiation and sodium hypochlorite methods are more effective than hydrogen peroxide/ultraviolet irradiation and hydrogen peroxide methods because of color removal of 83% and 64%, respectively.

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