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Part-IIExperimentalunder microwave irradiation (18 min) as per procedure described for the compound VIi.The crude product on recrystallization from hexane that yielded 4-chloro-2-chloromethyl-9-methoxy-benzo[4,5]thieno[3,2-d]pyrimidine (VIxi).M.P. : 180-182 o C; Yield: 80%Mol. Formula : C 12 H 8 Cl 2 N 2 OS; Mol. Wt. 299.18IR (KBr) cm -1 : 2980(γ C-H ), 1534(γ C=C ), 718(γ C-Cl )42. Synthesis of 4-chloro-2-chloromethyl-7,9-dimethylpyrido[3’,2’: 4,5]thieno[3,2-d]pyrimidine (VIxii)A mixture of 6-chloromethyl-2,4-dimethyl-7H-9-thia-1,5,7-triaza-fluoren-8-one (Vxvi,5.5 gm; 0.02 mole) and phosphorus oxychloride (5.6 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-7,9-dimethylpyrido[3’,2’: 4,5]thieno[3,2-d]pyrimidine (VIxii).M.P. : 116-118 o C; Yield: 86%Mol. Formula : C 12 H 9 Cl 2 N 3 S; Mol. Wt. 298.19IR (KBr) cm -1 : 2990(γ C-H ), 1629(γ C=C ), 730(γ C-Cl )43. Synthesis of 4-chloro-2-chloromethyl-6,7-dimethoxyquinazoline (VIxiii)A mixture of 2-chloromethyl-6,7-dimethoxyquinazolin-4(3H)-one (Vxvii, 5.0 gm; 0.02mole) and phosphorus oxychloride (5.6 gm; 0.04 mole) were reacted under microwaveirradiation (6 min) as per procedure described for the compound VIi. The crude producton recrystallization from hexane that yielded 4-chloro-2-chloromethyl-6,7-dimethoxyquinazoline(VIxiii).M.P. : 162-164 o C; Yield: 90%Mol. Formula : C 11 H 10 Cl 2 N 2 O 2 ; Mol. Wt. 273.12IR (KBr) cm -1 : 2963(γ C-H ), 1502(γ C=C ), 743(γ C-Cl ).380