SOLVENT EFFECT IN SUPERCRITICAL FLUIDS - KETO ENOL EQUILIBRIA OF ACETYLACETONE AND ETHYL ACETOACETATE

被引：19

作者：

YAMASAKI, K

KAJIMOTO, O

机构：

[1] Department of Chemistry, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto, 606, Kitashirakawa-Oiwakecho

来源：

CHEMICAL PHYSICS LETTERS | 1990年 / 172卷 / 3-4期

关键词：

D O I：

10.1016/0009-2614(90)85401-W

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The keto-enol equilibria for acetylacetone and ethyl acetoacetate were measured in supercritical fluids of various densities by use of NMR spectroscopy. In polar supercritical fluid, the keto form with the larger dipole moment was found to be more favorable. However, the change in the equilibrium with increasing fluid density was quite minor. This unexpected result may suggest that the enthalpy gain caused by the increasing solvation is cancelled by the entropy decrease of the whole system. © 1990.

引用

页码：271 / 274

页数：4

共 10 条

[1]

BHAR BN, 1956, ARK KEMI, V10, P223

[2] KETO-ENOL TAUTOMERISM IN BETA DICARBONYLS STUDIED BY NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY .1. PROTON CHEMICAL SHIFTS + EQUILIBRIUM CONSTANTS OF PURE COMPOUNDS [J].