Sulfonation of 4′-acetyl-, 4′-(tert-butyl)-dibenzo-18-crown-6 and (dibenzo-18-crown-6)-4′-sulfonic acid with potassium sulfate in polyphosphoric acid

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作者：
A. D. Grebenyuk
A. K. Tashmukhamedova
机构：
[1] M. Ulugbek National University of Uzbekistan,
来源：
Chemistry of Heterocyclic Compounds | 2009年 / 45卷
关键词：
4′-acetyl-, 4′-(; -butyl)dibenzo-18-crown-6; 4′-acetyl-4″(5″)-dibenzo-18-crown-6-sulfonic acid; 4′-(; -butyl)-4″(5″)-dibenzo-18-crown-6-sulfonic acid; (dibenzo-18-crown-6)-4′,4″(5″)-disulfonic acid; (dibenzo-18-crown-6)-4′-sulfonic acid; PPA (polyphosphoric acid); potassium sulfate; sulfonation;
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摘要：
The sulfonation of monosubstituted derivatives of dibenzo-18-crown-6 with potassium sulfate in polyphosphoric acid has been carried out. Sulfonic acids with various functional groups in the second nucleus of dibenzo-18-crown-6 have been obtained. A qualitative comparison of the reactivity of the substrates gave information on the transfer of the electronic influence of a substituent through the macrocycles. The displacement of electron density in the benzene nuclei of the substrates and the products of sulfonation was assessed from the value of the displacement of the proton signals in the 1H NMR spectra.
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页码：297 / 301
页数：4
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