Kasana, VirendraMalik, Faisal2019-02-062019-02-062018-08http://krishikosh.egranth.ac.in/handle/1/58100938772,3-Diphenylquinoxaline, benzimidazole and 2,4,5-triaryl imidazole derivatives have been synthesized using new catalysts by mechanochemical method and under solvent free condition. All the synthesized compounds have been screened for seed germination inhibition activity. 2,3-Diphenylquinoxaline derivatives have been synthesized by the reaction of 1,2-diamine compounds and 1,2-diketones catalysed by two different catalysts sulfamic acid and lemon juice under solvent free condition .The compounds synthesized are 2,3-diphenylquinoxaline and 6-nitro-2,3-diphenylquinoxaline. Benzimidazole derivatives have been synthesized by machanochemical method by the reaction of 1,2-diamine and benzaldehyde derivatives using sulfamic acid as a catalyst under solvent free condition . The compounds synthesized are 2-aryl benzimidazole, 2-(4-nitrophenyl) benzimidazole, 2-(2-nitrophenyl) benzimidazole, 2-(2-chlorophenyl) benzimidazole, 2-(3-methoxyphenyl) benzimidazole, 2-aryl-6-nitro benzimidazole and 2-(3-chlorophenyl) benzimidazole. 2,4,5-Trisubstituted imidazole derivatives were synthesized by reacting a mixture of benzaldehyde derivatives, benzil and ammonium acetate in the presence of calcium chloride dihydrate as a catalyst at 60 ˚C under solvent free condition . The synthesized compounds are 2,4,5-triphenyl-1H- imidazole, 2-(4-nitrophenyl)-4,5-diphenyl-1H-imidazole, 2-(4-chlorophenyl)-4,5-diphenyl-1H-imidazole and 2-(2-nitrophenyl)-4,5-diphenyl-1H-imidazole. All the compounds were tested for seed germination inhibition activity against Radish Sativus L . At 50 ppm concentration, most of the compounds were found to exhibit insignificant activity In comparison to standard pendimethiline. At 200 ppm concentration, 2,3-diphenylquinoxaline, 2-aryl benzimidazole and 2,4,5-triphenyl imidazole were found to exhibit activity at par with standard pendimethiline. So these compounds may be explored for development of potential herbicides.ennullThesis