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Specimen Mass spectra of some 4-chloro-2-chloromethylthienopyrimidinesPart-IIResults and Discussion11. Mass spectrum of ethyl 4-chloro-2-(chloromethyl)-5-methylthieno[2,3-d]pyrimidine-6-carboxylate (VIiv)ClNClNOSOC 11 H 10 Cl 2 N 2 O 2 SMol. Wt.: 305.18MS m/e : 305 (M + ), 289, 276, 259, 241, 232, 244, 197.Specimen IR spectra of some 4-chloro-2-(2-chloroethyl)-thienopyrimidines12. IR Spectra of 4-chloro-2-(2-chloroethyl)-5,6-dimethylthieno[2,3-d]pyrimidine (VIxv)ClNClSNC 10 H 10 Cl 2 N 2 SMol. Wt.: 261.17IR (KBr) cm -1 : 1478(γ C-C ), 841(γ C-Cl ).350