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General procedure: A mixture of malononitrile (1 mmol), isatin (1 mmol), dicarbonyl (1 mmol), PEGOSO3H(0.1 mmol), and water (2 mL) was stirred under reflux for the appropriate time (shown in Tables 3, 4). After completion of the reaction, the reaction mixture was filtered and the residue was washed with ethanol. The crude solid product was recrystallized from EtOH to afforded the pure products in high purity and yield.Assignment of the structures of the products was based on their 1H NMR, 13C NMR,and IR spectra.
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Reference:
Article; Nasseri; Zakerinasab; Research on Chemical Intermediates; vol. 41; 8; (2015); p. 5261 – 5270;,
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