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Study of three-dimensional structures of benzoylpyridine oximes and their ethers by1H and13C NMR spectroscopy

✍ Scribed by V. P. Lezina; S. G. Rozenberg; O. M. Glozman; L. A. Zhmurenko; L. M. Meshcheryakova; V. A. Zagorevskii

Publisher
Springer US
Year
1990
Tongue
English
Weight
531 KB
Volume
26
Category
Article
ISSN
0009-3122

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✦ Synopsis

Method A. Equimolar amounts of freshly sublimed isoindole Ic, d and N-substituted maleinimide IIa-e were stirred at room temperature in absolute ether (or ethyl acetate), after which the reaction mixture was maintained at the same temperature for several hours. When necessary, the solvent was removed by distillation in vacuo. The precipitated crystals were removed by filtration, and the adduct was purified by crystallization from alcohols (ethanol, isopropyl alcohol) or by column chromatography on silica gel (elution with chloroform). Method B. A mixture of equimolar amounts of freshly sublimed isoindole and the N-substituted maleinimide was refluxed in isopropyl alcohol. The time required to complete the reaction was determined by means of TLC. The precipitate was removed by filtration and purified by recrystallization from acetonitrile or alcohols (ethanol, isopropyl alcohol).

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