Fluorine-containing benzophenone derivatives

摘要

A fluorine-containing benzophenone derivative of the formula: <IMAGE> wherein R1 is a group of the formula: -OM (in which M is hydrogen or alkali metal), lower alkoxy, lower acyloxy, a group of the formula: <IMAGE> (in which R3 and R4 are same or different and hydrogen or lower alkyl) or a group of the formula: -OCH2COOR5 (in which R5 is hydrogen, lower alkyl or alkali metal); R2 is halogen, nitro, chlorosulfonyl, sulfo, trifluoromethyl or a group of the formula: -SCF2H; and m and n are each an integer of 1 to 4 provided that the sum of m and n is not more than 5 having selective herbicidal activities on grasses and crops.