NaAlO 2 ‐Promoted Mesoporous Catalysts for Room temperature Knoevenagel Condensation Reaction

2020 ◽  
Vol 5 (1) ◽  
pp. 300-305 ◽  
Author(s):  
Sreerangappa Ramesh ◽  
François Devred ◽  
Damien P. Debecker
Keyword(s):  
Room Temperature ◽  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
Mesoporous Catalysts ◽  
Knoevenagel Condensation Reaction

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.

Synthesis of β- and β,β-substituted Morita–Baylis–Hillman adducts using a two-step protocol

2012 ◽  
Vol 90 (5) ◽  
pp. 450-463 ◽  
Author(s):  
David I. Magee ◽  
Same Ratshonka ◽  
Jessica McConaghy ◽  
Maggie Hood
Keyword(s):  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
Facile Synthesis ◽  
Aliphatic Aldehydes ◽  
Tert Butyl ◽  
Keto Esters ◽  
Knoevenagel Condensation Reaction

The synthesis of a large number of β- and β,β-substituted keto esters was successful by the use of the Knoevenagel condensation reaction. The stereoselectivity of these reactions was improved by alteration of various substituent groups. Although there were few examples of complete Z selectivity, the use of tert-butyl acetoacetate with either aromatic or aliphatic aldehydes afforded Z selectivity. The selective reductions of these substituted keto esters was successfully achieved by using a combination of NaBH4 and CeCl3·7H2O or Yb(OTf)3, which allowed a facile synthesis of a large number of stereochemically pure substituted Morita–Baylis–Hillman adducts, including β,β-substituted adducts.

Sign in / Sign up

Export Citation Format

Share Document