Patent ID: 8921274

Claim:
A method of killing weeds, comprising applying to the weeds a compound represented by formula (I), or (II), or a salt thereof, wherein R 1 independently and at each occurrence represents H; or —C k H 2k+1 , —OC k H 2k+1 , —(C═O)C k H 2k+1 , —COOC k H 2k+1 , —C k H 2k−1 , —OC k H 2k−1 , —(C═O)C k H 2k−1 , or —COOC k H 2k−1 , each unsubstituted or substituted by one or more substituents selected from a heterocycle, an aryl, a phenylalkyl, a heterocycloalkyl phenyl, a heterocycloalkyl, a heterocycloalkoxyl, a phenoxyl; a phenoxy phenyl; a halogen, a cyano, a nitro, an alkoxyalkyl, an alkoxycarbonyl, and/or an amido; wherein k represents an integer from 1 to 8; R 2 represents H, CH 3 — or CH 3 CH 2 —; and R 3 represents a straight or branched chain C n H 2n+1 , or C n H 2n−1 group which is substituted by a halogen group or a cyano group wherein n is an integer from 3 to 15; or R 3 represents a straight or branched alkyl or alkenyl group containing 5-15 atoms.