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M.P. : 175-177 o C (175-177 o C) 3 ; Yield: 70%Mol. Formula : C 13 H 7 Cl 3 N 2 S; Mol. Wt. 329.63IR (KBr) cm -1 : 3030(γ C-H ), 1543(γ C=C ), 787 (γ C-Cl ).Part-IIExperimental1 H NMR (CDCl 3 )δppm : 4.90 (2H, s, CH 2 Cl), 2.71 (3H, s, CH 3 ), 7.20-7.57 (5H, m, Ar-H& 1H at 6)MS m/e : 329(M + ), 263, 257.39. Synthesis of 4-chloro-2-chloromethyl-10H-[1,2,4]triazino[6,1-b]quinazolin-10-one(VIix)A mixture of 2-chloromethyl-3H-[1,2,4]triazino[6,1-b]quinazoline-4,10-dione (Vxiii, 5.2gm; 0.02 mole) and phosphorus oxychloride (6.0 gm; 0.04 mole) were reacted undermicrowave irradiation (10 min) as per procedure described for the compound VIi. Thecrude product on recrystallization from hexane that yielded 4-chloro-2-chloromethyl-10H-[1,2,4]triazino[6,1-b]quinazolin-10-one (VIix).M.P. : 90-92 o C; Yield: 88%Mol. Formula : C 11 H 6 Cl 2 N 4 O; Mol. Wt. 281.1IR (KBr) cm -1 : 3046(γ C-H ), 1608(γ C=C ), 756(γ C-Cl ).40. Synthesis of 4-chloro-2-chloromethylbenzo[4,5]thieno[3,2-d]pyrimidine (VIx)A mixture of 2-chloromethyl-3H-benzo[4,5]thieno[3,2-d]pyrimidin-4-one (Vxiv, 5.0 gm;0.02 mole) and phosphorus oxychloride (6.0 gm; 0.04 mole) were reacted undermicrowave irradiation (12 min) as per procedure described for the compound VIi. Thecrude product on recrystallization from hexane that yielded 4-chloro-2-chloromethylbenzo[4,5]thieno[3,2-d]pyrimidine(VIx).M.P. : 220-222 o C; Yield: 76%Mol. Formula : C 11 H 6 Cl 2 N 2 S; Mol. Wt. 269.15IR (KBr) cm -1 : 3040(γ C-H ), 1547(γ C=C ), 768(γ C-Cl ).41. Synthesis of 4-chloro-2-chloromethyl-9-methoxybenzo[4,5]thieno[3,2-d]-pyrimidine (VIxi)A mixture of 2-chloromethyl-9-methoxy-3H-benzo[4,5]thieno[3,2-d]pyrimidin-4-one(Vxv, 5.0 gm; 0.02 mole) and phosphorus oxychloride (5.6 gm; 0.04 mole) were reacted379