Abstract:

Rice is one of the most important food crops in China, but weeds therein have serious adverse effects on rice yield and quality. The use of chemical herbicides is the most effective way to control weeds in rice field. Two series of novel sulfonylurea compounds, 2,5-substituted and 2,6-substituted benzenes, were designed and synthesized with their structures characterized by nuclear magnetic resonance spectroscopy (NMR) and high-resolution mass spectrometry (HRMS). The herbicidal activity and crop safety tests of rice field showed that most of the new molecules showed good herbicidal activity in rice field, especially compound 10a has shown better herbicidal activity (the visual control effect of preliminary screening is more than 90%) toward the main weeds Echinochloa crusgalli and Eclipta prostratethan than that of ethersulfuron-methyl and chlorsulfuron as controls. The herbicidal crop safety of compound 10a is comparable to that of the controls.

Key words: rice fields, sulfonylurea compounds, herbicidal activity, crop safety