物理化学学报 >> 1997, Vol. 13 >> Issue (04): 351-353.doi: 10.3866/PKU.WHXB19970412

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乙醇对超临界CO2中乙酰乙酸乙酯异构化平衡的影响

柯杰,鲁洁,钟明宏,邹蕾,韩布兴,阎海科   

  1. 中国科学院化学研究所，北京 100080
  • 收稿日期:1996-09-09 修回日期:1996-10-14 发布日期:1997-04-15
  • 通讯作者: 韩布兴

Effect of Ethanol on the Tautomerism of Ethyl Acetoacetate in Supercritical CO2

Ke Jie,Lu Jie,Zhong Ming-Hong,Zou Lei,Han Bu-Xing,Yan Hai-Ke   

  1. Institute of Chemistry,Academia Sinica,Beijing 100080,China
  • Received:1996-09-09 Revised:1996-10-14 Published:1997-04-15
  • Contact: Han Bu-Xing

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关键词: 超临界CO2, 乙酰乙酸乙酯, 异构化, 共溶剂, 聚集体

Abstract:

 The enol contents and equilibrium constants of the keto-enol tautomerism of ethyl acetoaretate were determined in various solvents using UV spectroscopy. It was found that in supercritical CO2 the enol content decreases dramatically in the presence of 0.047mol?L-1 ethanol. In liquid cyclohexane, however, the effect of the same amount of ethanol on enol content is not detectable. The strong cosolvent effect in SC CO2 results from the clustering of the cosolvent around the solute.

Key words: Supercritical CO2, Ethyl acetoacetate, Tautomerism, Cosolvent, Cluster