کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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59884 | 1419431 | 2015 | 7 صفحه PDF | دانلود رایگان |
Fructose was used as an efficient catalyst for three-component condensation reactions of aryl aldehydes, malononitrile, and dimedone in a mixture of EtOH and H2O as green solvents. The advantages of this method are a short reaction time, high yields, low cost, easy accesses, and simple work-up. The mechanism of the synthesis of a derivative of 4H-tetrahydrobenzo[b]pyran was clarified using spectroscopic kinetic methods. The activation energy (Ea = 65.34 kJ/mol) and related kinetic parameters (ΔG‡ = 69.14 kJ/mol, ΔS‡ = 20.99 J/(mol·K), and ΔH‡ = 62.89 kJ/mol) were calculated, based on the effects of temperature, concentration, and solvent. The first step in the proposed mechanism was identified as the rate-determining step (k1), based on the steady-state approximation.
We report kinetic results and detailed mechanistic studies for the synthesis of a derivative of 4H-tetrahydrobenzo[b]pyran, based on a global kinetic analysis method using UV-Vis spectroscopy.Figure optionsDownload as PowerPoint slide
Journal: Chinese Journal of Catalysis - Volume 36, Issue 5, May 2015, Pages 757–763