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IR (KBr) cm -1 : 1553(γ C=C ), 791(γ C-Cl ).Part-IIExperimental1 H NMR (CDCl 3 )δppm : 2.47 (3H, s, CH 3 ), 4.82 (2H, s, CH 2 at 2), 7.18-7.50 (5H, m, 4-Ar-H and 1H at 6)49. Synthesis of 4-chloro-2,5,6-trimethylthieno[2,3-d]pyrimidine (VIxix)A mixture of 2,5,6-trimethylthieno[2,3-d]pyrimidin-4(3H)-one (Vxxvi, 3.8 gm; 0.02mole) and phosphorus oxychloride (5.3 gm; 0.04 mole) were reacted under microwaveirradiation (4 min) as per procedure described for the compound VIi. The crude producton recrystallization from hexane that yielded 4-chloro-2,5,6-trimethylthieno[2,3-d]-pyrimidine (VIxix).M.P. : 102-104 o C; Yield: 90%Mol. Formula : C 9 H 9 ClN 2 S; Mol. Wt. 212.7IR (KBr) cm -1 : 1560(γ C=C ), 841(γ C-Cl ).50. Synthesis of 4-chloro-2-methyl-5-phenylthieno[2,3-d]pyrimidine (VIxx)A mixture of 2-methyl-5-phenylthieno[2,3-d]pyrimidin-4(3H)-one (Vxxvii, 4.8 gm; 0.02mole) and phosphorus oxychloride (5.3 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-methyl-5-phenylthieno[2,3-d]pyrimidine (VIxx).M.P. : 235-237 o C; Yield: 90%Mol. Formula : C 13 H 9 ClN 2 S; Mol. Wt. 260.74IR (KBr) cm -1 : 2932(γ C-H ), 1510(γ C=C ), 818(γ C-Cl ).51. Synthesis of ethyl 4-chloro-2,5-dimethylthieno[2,3-d]pyrimidine 6-carboxylate(VIxxi)A mixture of ethyl 3,4-dihydro-2,5-dimethyl-4-oxo-thieno[2,3-d]pyrimidine 6-carboxylate (Vxxviii, 5.0 gm; 0.02 mole) and phosphorus oxychloride (5.3 gm; 0.04mole) were reacted under microwave irradiation (4 min) as per procedure described forthe compound VIi. The crude product on recrystallization from hexane that yielded ethyl4-chloro-2,5-dimethylthieno[2,3-d]pyrimidine 6-carboxylate (VIxxi).383