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3604989 
Journal Article 
Kinetics of Diels-Alder reactions in critical binary solutions 
Yin, H; Hao, Z; Zhao, J; Zheng, P; Shen, W 
2016 
Yes 
Journal of Molecular Liquids
ISSN: 0167-7322 
216 
704-709 
WOS:000374073900087 
The kinetics of the Diels-Alder (D-A) reactions of N-ethylmaleimide with 2,3-dimethyl-1,3-butadiene and of 9,10-dimethyl-anthracene with diethyl maleate in two critical binary solutions n-tetradecane + dimethyl carbonate and n-nonane + diethyl maleate have been studied by the three-wavelength UV-spectrophotometry. It was found that neither speeding up nor slowing down effect for the first reaction was observed, which obeyed the Griffiths-Wheeler rule; while a very weak slowing down effect was detected for the second reaction, but significantly weaker as compared with the prediction by the Griffiths-Wheeler rule. It was attributed to that only less than 0.002% of diethyl maleate changed to the products during the reaction, hence the concentration of diethyl maleate may be considered as a fixed thermodynamic density in the critical reaction system, resulting in no thermodynamic slowing down being detected. (C) 2016 Elsevier B.V. All rights reserved. 
Critical slow down; Critical binary solution; D-A reaction; Three-wavelength spectrophotometry