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Part-IResults and Discussionneutral CO and ethyl ion along with chloromethyl ion to give fragment (c) m/e 149. Thefragmentation patten of compound IIi was given in Scheme-23 (Table-8).O+.ONHCl-Cl .NHNSaM + , m/e 255. - CH 2 Cl-CO-(-CH=CH-)S bm/e 219NNHScm/e 149NScheme-23Specimen IR Spectra of some 2-chloromethylthienopyrimidines:1. IR spectrum of 2-chloromethyl-5,6,7,8-tetrahydrobenzo(b)thieno[2,3-d]pyrimidin-4(3H)-one IIiONHSNC 11 H 11 ClN 2 OSMol. Wt.: 254.74Cl(KBr)/cm -1 : 3014(γ Ar-H ), 1662(γ CONH ), 754(γ C-Cl ).102