NEW MATERIAL:A diphenyl ether derivative of formula I [X, Y are halogen, CF 3 (when X is halogen, Y is CF 3 , and when X is CF 3 , Y is halogen); R 1 , 2 are H, lower alkyl, alkenyl, etc.].
EXAMPLE: 2'-Chloro-4'-trifluoromethyl-3-aminosulfonyl-4-nitrodiphenyl ether.
USE: Herbicide effective to a wide variety of weeds such as annual or perennial true- grass weeds, broad-leaved weeds, etc., by soil-treatment or stalk and leaf treatemnt. A herbicide for paddy rice field, applied to the weeds of the early-or middle-growing stage, or a herbicide for plowed field applied to the soil or to the stalks and leaves of weeds.
PROCESS: For example, the compound II is converted to the compound III according to the reaction formula, and the compound III is reacted with an amine of formula IV (R 3 , 4 are H, lower alkyl, or alkenyl) to afford the compound I.