Synthesis, Crystal Structure and Herbicidal Activity of Novel Sulfonylureas Containing Triazolinone Moiety

In order to search for efficient sulfonylurea herbicides, the title compounds were designed by introducing triazoli- nones into some known sulfonylurea structures. 23 novel sulfonylurea compounds had been synthesized and characterized by 1 H NMR, HRMS and X-ray diffraction. Herbicidal activities of title compounds were determined by pot-culture method. IC 50 values of some effective sulfonylurea compounds were tested by culture dish method. It was found that compound 5h attained the super-active level which was comparable to the controls as triasulfuron and cinosulfuron. It was worthy to note that com- pound 5h had potent inhibitory activity against Echinochloa crusgalli by pot-culture method at 3.75 g/ha. Keywords sulfonylurea; triazolinone; synthesis; crystal structure; herbicidal activity