Catalytic Activities of Dialkyltin Compounds Containing Silicon to the Condensation Reaction of Acetal(Ketal)-Alcohol

2013 ◽  
Vol 30 (3) ◽  
pp. 271
Author(s):  
Sen LIN ◽  
Yangyang GUO ◽  
Ruihong DENG ◽  
Zhiqiang HUANG
Keyword(s):  
Condensation Reaction ◽  
Catalytic Activities

Two new calix[4]resorcinarene-based coordination cages adjusted by metal ions for the Knoevenagel condensation reaction

2021 ◽  
Author(s):  
Wen-Yuan Pei ◽  
Bing-Bing Lu ◽  
Jin Yang ◽  
Tianqi Wang ◽  
Jian-Fang Ma
Keyword(s):  
Metal Ions ◽  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
Solvent Free ◽  
Catalytic Activities ◽  
Solvent Free Conditions ◽  
Coordination Cages ◽  
Knoevenagel Condensation Reaction

Two new calix[4]resorcinarene-based metal-coordinated cages have been synthesized through tuning metal ions, where they featured catalytic activities for the Knoevenagel condensation reaction under solvent-free conditions.

Synthesis of melamine-formaldehyde resin functionalised with sulphonic groups and its catalytic activities

2014 ◽  
Vol 68 (7) ◽  
Author(s):  
Lin-Jun Shao ◽  
Gui-Ying Xing ◽  
Chen-Ze Qi
Keyword(s):  
Thermal Treatment ◽  
Condensation Reaction ◽  
Acid Catalyst ◽  
Strong Acid ◽  
Chemical Processes ◽  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Catalytic Activities ◽  
Melamine Formaldehyde Resin ◽  
Catalysed Reaction

AbstractSpherical melamine-formaldehyde resin (MFR) particles were synthesised using the condensation reaction of melamine and formaldehyde with PEG-2000 as an additive. After thermal treatment at 200°C and then sulphonation by chlorosulphuric acid, an MFR-supported strong acid catalyst (SMFR) was prepared with an acidity of 3.23 mmol g−1. This new acid catalyst was evaluated in the reactions of esterification and acetalisation, with the results indicating that this novel acid catalyst was highly efficient in the traditional acid-catalysed reaction. Its high activity, stability and reusability give it great potential for “green” chemical processes.

Synthesis and catalytic properties of trans-A2B2-type metalloporphyrins in cyclohexane oxidation

2014 ◽  
Vol 92 (1) ◽  
pp. 49-53 ◽  
Author(s):  
Yujia Xie ◽  
Fengyong Zhang ◽  
Pingle Liu ◽  
Fang Hao ◽  
He’an Luo
Keyword(s):  
Metal Ions ◽  
Catalytic Properties ◽  
Condensation Reaction ◽  
Catalytic Performance ◽  
Cyclohexane Oxidation ◽  
Central Metal ◽  
Reaction Conditions ◽  
Catalytic Activities ◽  
Cobalt Nickel

A new efficient and mild protocol for synthesizing a series of trans-A2B2-porphyrins through a TFA-catalyzed condensation reaction between various aldehydes and dipyrromethanes has been developed. Several trans-A2B2-metalloporphyrins (cobalt, nickel) were synthesized and used to catalyze cyclohexane oxidation C–H bonds with dioxygen in the absence of additives and solvents. The results show that the catalytic activities were relative to the nature of the substituted groups and the central metal ions of trans-A2B2-metalloporphyrin. Cobalt metalloporphyrin presents better catalytic performance in the conversion of cyclohexane than the nickel metalloporphyrin under the same reaction conditions.

Combined experimental and theoretical rationalization on zinc(II) mediated unusual conversion of 18-membered Schiff-base macrocycle to 18-membered imine-amine macrocycle having imidazolidine side rings: investigation of their bio-relevant catalytic activities

2021 ◽  
Author(s):  
Tonmoy Chakraborty ◽  
Somali Mukherjee ◽  
Rumana Parveen ◽  
Arpita Chandra ◽  
Debabrata Samanta ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Condensation Reaction ◽  
Catalytic Activities

The 2:2 condensation reaction of 2,6-diformyl-4-isopropyl phenol and N'-(2-aminoethyl)ethane-1,2-diamine leads to a macrocycle Schiff base ligand (H2L) with N6O2 chromophore, which in presence of ZnX2 transformed into a new [2+2]...

scholarly journals Tetradentate Palladium(II) Salophen Complexes: Synthesis, Characterization and Catalytic Activities in Copper-Free Sonogashira Coupling Reaction

2018 ◽  
Vol 7 (3.11) ◽  
pp. 15 ◽  
Author(s):  
Shahrul Nizam Ahmad ◽  
Hadariah Bahron ◽  
Amalina Mohd Tajuddin
Keyword(s):  
Condensation Reaction ◽  
Coupling Reaction ◽  
13C Nmr Spectroscopy ◽  
Insertion Reaction ◽  
Catalyst Loading ◽  
Sonogashira Coupling ◽  
1H And 13C Nmr ◽  
Catalytic Activities ◽  
Sonogashira Coupling Reaction

This paper reports the synthesis and characterization of three salophen ligands; 2,2'-((1E,1'E)-(1,2 phenylenebis(azanylylidene))bis(methanylylidene))diphenol [L1H], 2,2'-((1E,1'E)-(1,2-phenylenebis(azanylylidene))bis (methanylylidene))bis(4-chlorophenol) [L1C] and 2,2'-((1E,1'E)-(1,2-phenylenebis(azanylylidene))bis(methanylylidene))bis(4-methoxylphenol) [L1OME]. The compounds were prepared from condensation reaction between salicylaldehyde, and its derivatives, with ortho-phenylenediamine. Their palladium(II) complexes, namely PdL1H, PdL1C and PdL1OME were synthesized through insertion reaction between the ligands with palladium(II) acetate. All compounds were characterized through melting point, elemental analysis, infrared spectroscopy, 1H and 13C NMR spectroscopy. Palladium(II) complexes were tested as homogenous catalysts in copper-free Sonogashira coupling reaction between iodobenzene and phenylacetylene in DMSO using triethylamine as base with 1.0 mmol% catalyst loading. The most performing catalyst was PdL1OME with 91% conversion followed by PdL1H (83%) and PdL1C (27%).   

scholarly journals Evaluation of Structural Properties and Catalytic Activities in Knoevenagel Condensation Reaction of Zeolitic Imidazolate Framework-8 Synthesized under Different Conditions

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Pham Dinh Du ◽  
Nguyen Viet Duy Thanh ◽  
Nguyen Trung Hieu
Keyword(s):  
Reaction Time ◽  
Structural Properties ◽  
High Temperatures ◽  
Room Temperature ◽  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
Zeolitic Imidazolate Framework ◽  
Catalytic Activities ◽  
Molar Ratios ◽  
Knoevenagel Condensation Reaction

In the present study, the zeolitic imidazolate framework-8 (ZIF-8) was synthesized at both room temperature and high temperatures. The effects of solvents, molar ratios of precursors, reaction time, and temperature on the structural properties of the as-prepared materials were investigated. Moreover, the surface morphologies of the obtained specimens were characterized using X-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy, and nitrogen adsorption methods. The results show that ZIF-8 was formed in methanol and water at room temperature and in dimethylformamide (DMF) at high temperatures. Further, in methanol, the molar ratios of precursors and reaction time have negligible effects on the morphologies and structures of ZIF-8; however, in DMF, the reaction temperature has a significant influence on the microstructures of ZIF-8. The catalytic activities of the obtained materials were evaluated using the Knoevenagel condensation reaction, and ZIF-8 proves to be an excellent solid base catalyst.

Photocatalytic activity of TiO2 synthesized by anodization and anodic spark deposition

MRS Advances ◽  
2020 ◽  
Vol 5 (61) ◽  
pp. 3141-3152
Author(s):  
Alma C. Chávez-Mejía ◽  
Génesis Villegas-Suárez ◽  
Paloma I. Zaragoza-Sánchez ◽  
Rafael Magaña-López ◽  
Julio C. Morales-Mejía ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Surface Characteristics ◽  
Amorphous Solids ◽  
X Ray Diffraction ◽  
X Ray ◽  
Catalytic Activities ◽  
Anodic Spark Oxidation ◽  
Porous Surfaces ◽  
Scanning Electron

AbstractSeveral photocatalysts, based on titanium dioxide, were synthesized by spark anodization techniques and anodic spark oxidation. Photocatalytic activity was determined by methylene blue oxidation and the catalytic activities of the catalysts were evaluated after 70 hours of reaction. Scanning Electron Microscopy and X Ray Diffraction analysis were used to characterize the catalysts. The photocatalyst prepared with a solution of sulfuric acid and 100 V presented the best performance in terms of oxidation of the dye (62%). The electric potential during the synthesis (10 V, low potential; 100 V, high potential) affected the surface characteristics: under low potential, catalyst presented smooth and homogeneous surfaces with spots (high TiO2 concentration) of amorphous solids; under low potential, catalyst presented porous surfaces with crystalline solids homogeneously distributed.

Synthesis, Characterization and Biological Activity of Nitrogen­ Oxygen-Sulfur (NOS) Transition Metal Complexes Derived from Novel S-2,4-dichlorobenzyldithiocarbazate with 5-fluoroisatin

2010 ◽  
Vol 7 (2) ◽  
pp. 67
Author(s):  
Mohd Abdul Fatah Abdul Manan ◽  
Hadariah Bahron ◽  
Karimah Kassim ◽  
Mohd Asrul Hafaz Mohamad ◽  
Syed Nazmi Sayed Mohamad
Keyword(s):  
Bacillus Subtilis ◽  
Schiff Base ◽  
Metal Complexes ◽  
Condensation Reaction ◽  
Schiff Base Complex ◽  
Inhibition Zone ◽  
Azomethine Nitrogen ◽  
Strong Activity ◽  
Chelating Ligand ◽  
Physico Chemical

A novel Schiff base containing nitrogen-oxygen-sulfur (NOS) donor atoms formed from the condensation reaction of S-2,4-dichlorobenzyldithiocarbazate (S-2,4BDTC) with 5-fluroisatin has been synthesized. Complexes of cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) with this Schiff base have been prepared and characterized using elemental analysis and various physico-chemical techniques. In the cobalt(II) and nickel(II) complexes the Schiff base behaves as a uninegatively charged tridentate nitrogen-oxygen-sulfur (NOS) chelating ligand, bonding through the azomethine nitrogen, thiolate sulfur and carbonylic oxygen of the isatin moiety. However, in the copper(II), zinc(II) and cadmium(II) complexes the Schiff base behaves as a nitrogen-sulfur (NS) bidentate chelating ligand, bonding through the azomethine nitrogen and thiolate sulfur. The Schiff base and the metal complexes were evaluated with respect to antimicrobial activity, which was performed in relation to two selected pathogenic microbials (Bacillus subtilis and Pseudomonas aeruginosa). It was observed that only the zinc Schiff base complex exhibited strong activity against the Bacillus subtilis bacteria with an inhibition zone of 25 mm. 

Synthesis, Characterization and Biological Activity of NitrogenOxygen-Sulfur (NOS) Transition Metal Complexes Derived from Novel S-2,4-dichlorobenzyldithiocarbazate with 5-fluoroisatin

2010 ◽  
Vol 7 (2) ◽  
pp. 67
Author(s):  
Mohd Abdul Fatah Abdul Manan ◽  
Hadariah Bahron ◽  
Karimah Kassim ◽  
Mohd Asrul Hafiz Muhamad ◽  
Syed Nazmi Sayed Mohamad
Keyword(s):  
Bacillus Subtilis ◽  
Schiff Base ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Condensation Reaction ◽  
Inhibition Zone ◽  
Azomethine Nitrogen ◽  
Strong Activity ◽  
Chelating Ligand ◽  
Physico Chemical

A novel Schiff base containing nitrogen-oxygen-sulfur (NOS) donor atoms formed from the condensation reaction of S-2,4- dichlorobenzyldithiocarbazate (S-2.4BDTC) with 5-fluroisatin has been synthesized. Complexes of cobalt(ll), nickel(ll), copper(ll), zinc(ll) and cadmium(ll) with this Schiff base have been prepared and characterized using elemental analysis and various physico-chemical techniques. In the cobalt(ll) and nickel(II) complexes the SchifJbase behaves as a uninegatively charged tridentate nitrogen-oxygen-sulfur (NOS) chelating ligand, bonding through the azomethine nitrogen, thiolate sulfur and carbonylic oxygen of the isatin moiety. However. in the copper(ll), zinc(II) and cadmium(II) complexes the Schiff base behaves as a nitrogen-sulfur (NS) bidentate chelating ligand, bonding through the azomethine nitrogen and thiolate sulfur. The Schiff base and the metal complexes were evaluated with respect to antimicrobial activity, which was performed in reallion to two selected pathogenic microbials (Bacillus subtilis and Pseudomonas aeruginosa). It was observed that only the zinc Schiffbase complex exhibited strong activity against the Bacillus subtilis bacteria with an inhibition zone of25 mm.

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