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Part-IIIExperimentalM.P. : 188-190 o C; Yield 57%.Mol. Formula : C 18 H 15 ClN 2 OS; Mol. Wt. 342.84IR (KBr) cm -1 : 3250(γ NH ), 3009(γ CH ), 1524(γ CH ).27. Synthesis of [6-methyl-4-(3-phenoxyphenyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl](phenyl)methanone(VIIxxvii) from benzoylacetone.A mixture of benzoylacetone (0.0060 mole; 0.98 gm), 3-phenoxyphenylbenzaldehyde(0.0050 mole; 1 gm) and thiourea (0.0075 mole; 0.57 gm) in ethanol (10 ml) were reactedas per procedure for the compound (VIIi) to get of [4-(3-phenoxyphenyl)-6-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl](phenyl) methanone (VIIxxvii).M.P. : 208-210 o C; Yield 57%.Mol. Formula : C 24 H 20 N 2 O 2 S; Mol. Wt. 400.49IR(KBr) cm -1 : 3287(γ NH ), 3092(γ CH ), 1573(γ CH ).1 H NMR(DMSO-d 6 )δppm : 1.75 (s, 3H, CH 3 ), 5.46 (d, 1H, H at 4, J = 3.24), 6.68-7.61(m, 14H, Ar-H ), 9.25 (s, 1H, NH at 1), 9.95 (s, 1H, NH at 3).28. Synthesis of [6-methyl-2-thioxo-4-(3,4,5-trimethoxyphenyl)-1,2,3,4-tetra-hydropyrimidin-5-yl](phenyl)methanone(VIIxxviii) from benzoylacetone.A mixture of benzoylacetone (0.0061 mole; 0.99 gm), 3,4,5-trimethoxybenzaldehyde(0.0051 mole; 1 gm) and thiourea (0.0091 mole; 0.69 gm) in ethanol (10 ml) were reactedas per procedure for the compound (VIIi) to get of [4-(3,4,5-trimethoxyphenyl)-6-methyl-2-thioxo-1,2,3,4-tetrahydro-pyrimidin-5-yl](phenyl) methanone (VIIxxviii).M.P. : 228-230 o C; Yield 76%.Mol. Formula : C 21 H 22 N 2 O 4 S; Mol. Wt. 398.48IR(KBr) cm -1 : 3282(γ NH ), 2994(γ CH ), 1608(γ CH ).29. Synthesis of [4-(2-hydroxyphenyl)-6-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl](phenyl)methanone(VIIxxix) from benzoylacetone.A mixture of benzoylacetone (0.0098 mole; 1.59 gm), 2-hydroxybenzaldehyde (0.0081mole; 1 gm) and thiourea (0.012 mole; 0.92 gm) in ethanol (10 ml) were reacted as perprocedure for the compound (VIIi) to get of [4-(2-hydroxyphenyl)-6-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl]-(phenyl)methanone (VIIxxix).484