2-SUBSTITUTED BENZOTHIAZO-1,2,4-TRIAZOLINONE DERIVATIVES, THE PREPARATION METHODS AND HERBICIDAL EFFECTS THEREOF

摘要

The present application discloses a kind of 2-substituted benzothiazo-1,2,4-thiazolinone derivatives of general formula I, the preparation methods and herbicidal effects thereof. In general formula I, X is F, Cl or Br; n is 0, 1 or 2; R<SUP>1</SUP> is alkyl, substituted alkyl, alkenyl, a- carboxylates, substituted benzyl or substituted aromatic azo-ring methylene; R<SUP>2</SUP> is methyl or difluoromethyl; and R<SUP>3</SUP> is methyl or trifluoromethyl. The present compounds have obviously weed-clearing activity on Echinochloa crusgalli, Digitaria sanguinalis, Setaria viridis, Brassica juncea, Amaranthus retroflexus, and Cheopodium serotinum in the dose of 300g active ingredient/ ha., and can be used as herbicide.