4-ETHYL-3-(SUBSTITUTED PHENYL)-1-(3-TRIFLUOROMETHYL-4-SUBSTITUTED PHENYL)PYRROLIDINE-2-THIONE DERIVATIVE AND HERBICIDE WITH THE SAME AS ACTIVE INGREDIENT

摘要

NEW MATERIAL:A compound of formula I (R is H or Cl; X is H, F, Cl, Br, CF3 or methyl; n is 1 or 2, being the number of substituents expressed by X). EXAMPLE:4-Ethyl-3-phenyl-1-(3-trifluoromethylphenyl)pyrrolidine-2-thione. USE:A herbicide. The present compound has such characteristics that the 3-side halogen atom in the pyrrolidine-2-thione ring has been converted to a specific phenyl group, and the 4-site chloromethyl group to ethyl group; therefore, it is highly active leading to expansion of the selectivity allowance between rice and weeds in paddy fields, resulting in its easier application to paddy fields. PREPARATION:The objective compound of the formula I can be obtained by reaction between a 2-pyrrolidinone dervative of formula II and and e.g. phosphorus pentasulfide, Lawsons reagent, etc.