Monitoring the pH-Dependent Oximation of Methyl Ethyl Ketone and Benzaldehyde by in situ Fourier Transform IR Spectroscopy in a Heterogeneous Liquid-Liquid Two-Phase System

被引：8

作者：

Keglevich, Gyorgy ^{[1
]}

Csontos, Istvan ^{[1
]}

Nikolett Szilagyi ^{[1
]}

机构：

[1] Budapest Univ Technol & Econ, Dept Organ Chem & Technol, H-1521 Budapest, Hungary

来源：

SPECTROSCOPY LETTERS | 2009年 / 42卷 / 02期

关键词：

Heterogeneous phase reaction; in situ Fourier transform IR; intermediate; monitoring; oximation; pH dependence; NUCLEAR-MAGNETIC-RESONANCE; HYDROXYLAMINE; ACETONE; DEHYDRATION; CATALYSIS; NH2OH;

D O I：

10.1080/00387010802428476

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

In situ Fourier transform IR spectroscopy was a useful tool in monitoring the pH-dependent and two-step oximation of methyl ethyl ketone and benzaldehyde in a liquid-liquid two-phase system, one phase of which was water. Carrying out the oximations at pH 8, the oximation was complete within 45min and the corresponding carbonyl compound-hydroxylamine adduct (2) could be detected as an intermediate, but at pH 10, the corresponding oxime (3) was formed faster, practically without the appearance of the intermediate. At pH2.5 using methyl ethyl ketone, the protonated form of the corresponding oxime (3'a) developed gradually without the transient appearance of the intermediate (2). pH dependence of the 3a3'a and 3'a3a interconversions were studied in separate experiments.

引用

页码：67 / 72

页数：6

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