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S. No R X MolFormula(Sol. of Recryst.)VIIxxvO S C 20 H 20 N 2 O 3 S(E)OM.P.( o C)IR (cm -1 )(KBr)240-242 3288(γ NH ),2991(γ CH ),1612,1571(γ CH ).Mass(m/e)NMR (δppm)(DMSO-d 6 )Part-IIIResults and Discussion-- 1.78 (s, 3H, CH 3 ), 3.78 (s, 3H, -OCH 3 ), 3.81 (s, 3H, -OCH 3 ), 5.42 (d, 1H, H at 4, J = 3.12), 6.77-6.80 (m, 3H,Ar-H phenyl at 4), 7.37-7.51 (m, 5H, Ar-H of benzoyl),9.16 (s, 1H, NH at 1), 9.90 (s, 1H, NH at 3)VIIxxviClSC 18 H 15 ClN 2 OS(E)188-190 3250(γ NH ),3009(γ CH ),1524(γ CH ).-- --VIIxxviiOSC 24 H 20 N 2 O 2 S(E)208-210 3287(γ NH ),3092(γ CH ),1573(γ CH ).-- 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).VIIxxviiiOOOSC 21 H 22 N 2 O 4 S(E)228-230 3282(γ NH ),2994(γ CH ),1608(γ CH ).-- --VIIxxixOHSC 18 H 16 N 2 O 2 S(E)248-250 3206(γ NH ),2991(γ CH ),1514(γ CH ).-- --VIIxxx S C 18 H 16 N 2 OS(E)E = Ethanol221-220 3283(γ NH ),3170(γ CH ),1587(γ CH ).-- --461