232-233[degrees]C; IR (KBr, [cm.sup.-1]): 3215 (N-H), 1720 (ring C=O), 1670 (C=O); [.sup.1]H-NMR (500 MHz, DMSO-[d.sub.6]): [delta] (NH proton not observed), 8.32; 8.10 (2s, 1H, imidazothiazole [C.sub.5]-H), 7.76 (d, 2H, J=8.30 Hz, 4-Brphenyl [C.sub.2,6]-H), 7.58 (d, 2H, J=7.32 Hz, 4-Brphenyl [C.sub.3,5]-H), 7.38-7.19 (m, 5H,
phenyl), 7.03; 6.84 (2s, 1H, imidazothiazole [C.sub.2]-H), 4.82 (s, 2H, NC[H.sub.2]), 4.15-3.83 (m, 4H, C[H.sub.2]CO and SC[H.sub.2]).
(E)-(2-(4-Chlorostyryl)-1H-benzimidazol-6-yl)(
phenyl) methanone ield (3.2 g, 90%), m.p 130-132[degrees]C, IR (KBr, [v.sub.max] in [cm.sup.-1]): 3426 (-NH), 2898 (=C-H), 1909 (C=N), 1601 (C=C), 1680 (C=O), [sup.1]H NMR (DMSO-[d.sub.6], 400 MHz) [delta] ppm: 7.09-7.13 (d, 1H, -C=CH- vinulic proton, [J.sub.H-H] = 16.4 Hz), 73-79 (m, 8 aryl, 4
phenyl), 8.09-8.13 (d, IH, -CH=C-, vinylic proton, [J.sub.H-H] = 16.4 Hz), 10.2 (s, 1H, -NH of benzimidazole), [sup.13]C NMR (DMSO-[d.sub.6], 100 MHz) [delta] ppm: 102.29, 106.24, 108.53, 110, 112, 120, 121, 122, 128.51, 129, 130, 132, 142, 148, 152, 190.91 (12 aryl carbons, 6
phenyl carbons, 2 vinylic carbons, 1 imidazole quaternary carbon and 1 carbonyl carbon), MS (m/z): 359.1 ([M.sup.+*]), Anal.
4,4,4- trichloro-3-oxo-2-(phenyl-hydrazono)-butyric acid ethyl ester 2 was prepared by diazotization of required primary amine is diazotized with sodium nitrile and HCl mixture at 0-5 and it is coupled with ethyl 4,4,4-trichloro-3-oxobutanoate and afforded
phenyl diazonium aceto acetic ester