Homogeneous catalyst in ethanol

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4,4’-trimethylenedipiperidine as a nitrogen heterocycle solvent and/or catalyst: Liquid phase tandem Knoevenagel–Michael condensation

Liquid phase tandem Knoevenagel–Michael condensation of various aromatic and heteroaromatic aldehydes with barbituric acid or 2-thiobarbituric acid and malononitrile was studied in a one-pot three-component reaction. For the first time, TMDP was employed as a safe and efficient solvent and/or catalyst in the liquid and aqueous ethanol medium, respectively, for the practical and eco-friendly Knoevenagel–Michael condensation.

10p tudichquannguyet 29-11-2021 8 1 Download

Salicylic aldehyde-N(4)-(4-ethoxyanilinyl) thiosemicarbazone: Optimization of synthesis by surface response and structural characteristics

Salicylic aldehyde-N(4)-(4-ethoxyanilinyl)thiosemicarbazone (H2L) was synthesized by condensation between salicylic aldehyde (SA) and N(4)-(4-ethoxyanilinyl)thiosemicarbazide (TSCZ) in presence of glacial acetic acid as a homogeneous catalyst in ethanol. As a result of analysis by the surface response based on Box – Hunter model with the confidence level of 95%, the expectable yield reached the highest point (around 68%) at 80oC for 10 minutes when approximately 1 mole of SA reacted to equivalently 1 mole of TSCZ.

11p vithomasedison2711 15-08-2019 29 0 Download