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2) using ethyl acetate/ hexane (4:6) as eluent. After completion the reaction mixture was cooled at room temperature, the solid that separated was collected by filtration, washed with water and recrystallized from ethanol to give 5-ethoxy-carbony-6-methyl -4-phenyl-3,4-dihydropyrimidin-2(1H)-one in 95% yield, mp. 201 °C (202 °C) [14]. Similarly other aldehydes were reacted with urea and β-dicarbonyl compound and their reaction times and yields are presented in Table.
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