scholarly journals Carboxylate-Functionalized P, N-Ligated Cobalt Catalysts for Alkene Hydrosilylation

2020 ◽  
Vol 17 ◽  
Author(s):  
Yangyang Ma ◽  
Jiayun Li ◽  
Ying Bai ◽  
Jiajian Peng
Keyword(s):  
Activation Energy ◽  
Reaction Time ◽  
Efficient Method ◽  
Cobalt Catalysts ◽  
Carboxyl Groups ◽  
Catalytic Hydrosilylation ◽  
P Ligands

: A series of N, P-ligands bearing carboxyl groups has been synthesized. These have been applied in conjunction with cobalt naphthenate in a facile, economic, and efficient method for the catalytic hydrosilylation of alkenes. In the presence of KOtBu as an additive, the reaction time and activation energy are greatly reduced.

Dynamic Model of Rapeseed Oil Hydrolysis Reaction in Sub-Critical Water

2013 ◽  
Vol 860-863 ◽  
pp. 510-513 ◽  
Author(s):  
Yi Zhe Li ◽  
Hua Wang ◽  
Gui Rong Bao
Keyword(s):  
Activation Energy ◽  
Reaction Time ◽  
Dynamic Model ◽  
Rapeseed Oil ◽  
Reaction Order ◽  
Volume Ratio ◽  
Hydrolysis Reaction ◽  
Water Volume ◽  
Oil Water ◽  
Oil Hydrolysis

Experiments of Rapeseed Oil Hydrolysis Reaction in Sub-Critical Water (250-300°C, 5-60min) are Conducted in this Paper. Results Show that the Best Conditions for Rapeseed Oil Hydrolysis are Reaction Temperature 290°C, Oil-Water Volume Ratio 1:3, Reaction Time 40min, and Conversion Rate 98.9%. Meanwhile, Kinetic Analysis of this Hydrolysis Reaction is Presented. we Learn that Hydrolysis Reaction Order is 0.7778, Activation Energy is 55.34kJ/mol and the Dynamic Model is .

scholarly journals Is carboxylation an efficient method for graphene oxide functionalization?

2020 ◽  
Vol 2 (9) ◽  
pp. 4085-4092
Author(s):  
Shi Guo ◽  
Jésus Raya ◽  
Dingkun Ji ◽  
Yuta Nishina ◽  
Cécilia Ménard-Moyon ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Efficient Method ◽  
Chloroacetic Acid ◽  
Carboxyl Groups ◽  
Partial Reduction

We investigated the carboxylation of graphene oxide using chloroacetic acid and different amounts of NaOH. Increase of carboxyl groups was observed only at high amounts of NaOH, but partial reduction attenuates the yield of further functionalization.

Fast and Efficient Synthesis of Mono-(6-p-toluenesulfonyl)-β-cyclodextrin via Ultrasound Assisted Method

2015 ◽  
Vol 1083 ◽  
pp. 51-54 ◽  
Author(s):  
Wen Qian Zheng ◽  
Mei Xia Du ◽  
Feng Feng ◽  
Guo Lin Chen ◽  
Min Liao ◽  
...  
Keyword(s):  
Reaction Time ◽  
Efficient Method ◽  
Water Solution ◽  
Synthetic Methods ◽  
Efficient Synthesis ◽  
Alkaline Water ◽  
Novel Method ◽  
Ultrasound Assisted

The mono-(6-p-toluenesulfonyl)-β-cyclodextrin was firstly synthesized fast and efficiently by adopting ultrasound assisted method in alkaline water solution. The reaction time was only 40 min but with the yield of 31.1% under ultrasound condition. Compared with the conventional synthetic methods, the proposed novel method could shorten the reaction time and improve the yield. It is a simple, rapid and efficient method.

Efficient Copper-Catalyzed Synthesis of Substituted Pyrazoles at Room Temperature

Synlett ◽  
2018 ◽  
Vol 29 (20) ◽  
pp. 2689-2692 ◽  
Author(s):  
Haifeng Wang ◽  
Xiangli Sun ◽  
Shuangling Zhang ◽  
Guanglu Liu ◽  
Chunjie Wang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Catalytic System ◽  
Efficient Method ◽  
Room Temperature ◽  
Copper Catalyst ◽  
Condensation Reaction ◽  
Reaction Conditions ◽  
Short Reaction Time ◽  
Acid Catalyzed ◽  
Substituted Pyrazoles

An efficient method for the synthesis of pyrazoles through a copper-catalyzed condensation reaction has been developed. The new catalytic system not only maintained a broad substrate scope but was also active under acid-free reaction conditions, overcoming the conventional requirement for an acid-catalyzed system. Furthermore, the copper catalyst enabled this reaction to be performed at room temperature and in a short reaction time.

Catalytic Oxidation of 4,4'-Dibromobiphenyl in Sub-Critical Water with Mn0.9-Co0.1-Ce-Oxide

2011 ◽  
Vol 282-283 ◽  
pp. 13-16
Author(s):  
Jin Yang Chen ◽  
Ru Yi Ruan ◽  
Zhi Li
Keyword(s):  
Activation Energy ◽  
Reaction Time ◽  
Apparent Activation Energy ◽  
Hydrothermal Method ◽  
Subcritical Water ◽  
Degradation Kinetics ◽  
Removal Rate ◽  
Oxidative Degradation ◽  
Cod Removal Rate ◽  
Co Precipitation

A complex mental oxide Mn0.9-Co0.1-Ce-oxide was prepared by co-precipitation-hydrothermal method and it was used as catalyst to oxidative degradation of 4,4- dibromobiphenyl (4,4’-DBB) in subcritical water. The optimization conditions is obtained as follows: 5% Mn0.9-Co0.1-Ce-oxidecatalyst, m(H2O2):m(4,4’-DBB)=200:1,temperature of 613K, reaction time of 20 minutes, and COD removal rate is more than 99 %. In the temperature range of 603–633 K, the degradation kinetics is studied and apparent activation energy is 35.92 and 46.69 kJ/mol for no catalyst and 5% Mn0.9-Co0.1-Ce-oxide, respectively.

scholarly journals The Optimum Reaction Time, Activation Energy and Frequency Factor of Methyl Ricinoleate Nitration

2013 ◽  
Vol 13 (1) ◽  
pp. 36-40 ◽  
Author(s):  
Abdullah Abdullah ◽  
Triyono Triyono ◽  
Wega Trisunaryanti ◽  
Winarto Haryadi
Keyword(s):  
Activation Energy ◽  
Reaction Time ◽  
Methyl Ricinoleate ◽  
Frequency Factor ◽  
Optimum Reaction

Determination of the optimum reaction time, activation energy (Ea) and frequency factor (A) of methyl ricinoleate nitration has been done. The nitration was conducted with the mole ratio of methyl ricinoleate to HNO3 of 1:15. The reaction was conducted at temperatures of 29 and 64 °C with a variation of reaction time for 10, 20, 30, 60, 90, 120, and 150 min. Determination of activation energy and frequency factor was performed in a temperature of 29, 33, 38, 44, 49, 57 and 64 °C. The results showed that the optimum reaction time is 90 min. The activation energy (Ea) and frequency factor (A) was 44.5 kJ/mol and 4.780 x 103 sec-1, respectively.

scholarly journals Selective Hydrogenation of Phenol to Cyclohexanol over Ni/CNT in the Absence of External Hydrogen

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 846 ◽  
Author(s):  
Changzhou Chen ◽  
Peng Liu ◽  
Minghao Zhou ◽  
Brajendra K. Sharma ◽  
Jianchun Jiang
Keyword(s):  
Reaction Time ◽  
Physicochemical Properties ◽  
Efficient Method ◽  
Selective Hydrogenation ◽  
Transfer Hydrogenation ◽  
Impregnation Method ◽  
Complete Conversion ◽  
Phenol Derivatives ◽  
Successive Step ◽  
Icp Analysis

Transfer hydrogenation is a novel and efficient method to realize the hydrogenation in different chemical reactions and exploring a simple heterogeneous catalyst with high activity is crucial. Ni/CNT was synthesized through a traditional impregnation method, and the detailed physicochemical properties were performed by means of XRD, TEM, XPS, BET, and ICP analysis. Through the screening of loading amounts, solvents, reaction temperature, and reaction time, 20% Ni/CNT achieves an almost complete conversion of phenol after 60 min at 220 °C in the absence of external hydrogen. Furthermore, the catalytic system is carried out on a variety of phenol derivatives for the generation of corresponding cyclohexanols with good to excellent results. The mechanism suggests that the hydrogenation of phenol to cyclohexanone is the first step, while the hydrogenation of cyclohexanone for the generation of cyclohexanol takes place in a successive step. Moreover, Ni/CNT catalyst can be magnetically recovered and reused in the next test for succeeding four times.

Efficient Method for the Determination of the Activation Energy of the Iodide-Catalyzed Decomposition of Hydrogen Peroxide

2014 ◽  
Vol 91 (8) ◽  
pp. 1216-1219 ◽  
Author(s):  
William Sweeney ◽  
James Lee ◽  
Nauman Abid ◽  
Stephen DeMeo
Keyword(s):  
Activation Energy ◽  
Hydrogen Peroxide ◽  
Efficient Method

THE KINETICS OF THE REACTION OF ACTIVE NITROGEN WITH ETHYLENE

1962 ◽  
Vol 40 (4) ◽  
pp. 686-691 ◽  
Author(s):  
E. M. Levy ◽  
C. A. Winkler
Keyword(s):  
Nitric Oxide ◽  
Activation Energy ◽  
Low Temperature ◽  
Copper Oxide ◽  
Cobalt Catalyst ◽  
Cobalt Catalysts ◽  
Active Nitrogen ◽  
Temperature Range ◽  
P Factor ◽  
Kinetics Of

A comparison has been made of five methods for terminating the reaction of active nitrogen with ethylene in the temperature range 295° to 673° K. These were based on deactivating the active nitrogen by low-temperature trapping, by addition of nitric oxide, and by passing it over copper oxide or cobalt catalysts. With the nitric oxide and cobalt catalyst techniques, which appeared to be the most reliable of those used, an activation energy of 400 ± 200 cal/mole, with a P factor of about 10−5, have been determined for the reaction.

A clean, simple and efficient synthesis of trans-[3-(aryl)-2,3-dihydrofuro[3,2-h] quinolin-2-yl]-(4-chlorophenyl)methanones

2017 ◽  
Vol 41 (7) ◽  
pp. 380-383
Author(s):  
Maryam Salari ◽  
Alireza Hassanabadi ◽  
Mohammad H. Mosslemin
Keyword(s):  
Reaction Time ◽  
Green Chemistry ◽  
Aromatic Aldehyde ◽  
Efficient Method ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
Short Reaction Time ◽  
High Yields

We report a green and efficient method for the synthesis of trans-[3-(aryl)-2,3-dihydrofuro[3,2- h]quinolin-2-yl]-(4-chlorophenyl) methanones from the condensation of 2-[2-(4-chlorophenyl)-2-oxoethyl)]isoquinolinium bromide with 8-hydroxyquinoline and an aromatic aldehyde in the presence of catalytic amounts of choline hydroxide in water at reflux conditions. This new protocol employing choline hydroxide, which is a green and inexpensive catalyst, offers advantages such as mild reaction conditions, short reaction time, high yields and does not involve any hazardous solvent. Therefore, this procedure can be classified as green chemistry.

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