A series of 3,4-dihydropyrimidin-2(1H)-one(thione) derivatives was synthesized using Co(NO 3 ) 2 .6H 2 O in solvent-free condition. Avoiding organic solvents during the chemical reactions leading to an economic approach is effective. The reaction is characterized by high efficiency, short reaction time, high yields, simple experimental procedure, availability of catalyst and environmentally friendly reaction conditions.
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