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Part-IIIExperimentalM.P. : 248-250 o C; Yield 61%.Mol. Formula : C 18 H 16 N 2 O 2 S; Mol. Wt. 324.4IR(KBr) cm -1 : 3206(γ NH ), 2991(γ CH ), 1514(γ CH ).30. Synthesis of (6-methyl-4-phenyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl)-(phenyl)methanone (VIIxxx) from benzoylacetone.A mixture of benzoylacetone (0.011 mole; 1.83 gm), benzaldehyde (0.0094 mole; 1 gm)and thiourea (0.014 mole; 1.07 gm) in ethanol (10 ml) were reacted as per procedure forthe compound (VIIi) to get of (6-methyl-4-phenyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl)(phenyl)methanone (VIIxxx).M.P. : 218-220 o C; Yield 61%.Mol. Formula : C 18 H 16 N 2 OS; Mol. Wt. 308.4IR(KBr) cm -1 : 3283(γ NH ), 3170(γ CH ), 1587(γ CH ).485