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Part-IResults and DiscussionSpecimen IR spectrum of some 5,6-disubstituted 2-((1H-benzo[d]imidazol-2-ylsulfinyl)-methyl)thieno[2,3-d]pyrimidin-4(3H)-ones:1. IR spectrum of 2-(1H-benzimidazol-2-yl)methylsulfinyl-5,6,7,8-tetrahydrobenzo(b)-sulfinyl[2,3-d]pyrimidin-4-(3H)-one (Ivi)ONHOSNSNC 18 H 16 N 4 O 2 S 2Mol. Wt.: 384.48HNIR (KBr) cm -1 : 3235(γ NH ), 2946(γ C-H ), 1655(γ CONH ). 1060(γ S=O ), 747(γ C-S ).2. IR spectrum of 2-[(1H-benzimidazol-2-ylsulfinyl)methyl]-5-(4-methylphenyl)thieno-[2,3-d]pyrimidin-4(3H)-one (Ivxiii)ONHOSNSNC 21H 16N 4O 2S 2Mol. Wt.: 420.51HNIR (KBr) cm -1 : 3195(γ NH ), 3055(γ C-H ), 1678(γ CONH ), 1046(γ S-O ), 739(γ C-S ).114