Synthesis and characterization of a group of dihydropyrimido-benzimidazole photosystem II herbicides |
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| Institution: | 1. Polymer Materials Laboratory, Department of Industrial Chemistry, Alagappa University, Karaikudi 630006, India;2. Central Instrumentation Facility, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi 630006, India;1. College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, PR China;2. Isotope Production Group, Chemistry Division, Pakistan Institute of Nuclear Science and Technology (PINSTECH), P.O. Nilore, Islamabad, Punjab, Pakistan;3. Labeled Compounds Department, Hot Laboratories Center, Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt |
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| Abstract: | A group of 28 dihydropyrimido-benzimidazole analogs and derivatives was tested for herbicidal activities. The 1:1 mixture of 7-fluoro- and 8-fluorodihydropyrimido-benzimidazole had the greatest biological activity. Activity is increased by methylation of nitrogen 2. None of the active compounds was inhibitory to nonphotosynthetic tissue-culture cells in vitro. The I50 of inhibition of growth of green duckweed plants and that of in vitro photosynthesis activity matched the I50 of inhibition of photosystem II activity. Fluorescence analyses of photosystem II activity indicated inhibition at the same step as did many triazine, phenylurea, pyridazinone, and uracil herbicides. As the compounds showed insufficient activity on recently evolved triazine-resistant weed biotypes, their further development was terminated, despite their novel chemistry. |
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