2-benzoyl pyrrole and benzoyl imidazole herbicides

Abstract

Herbicidal compounds have the formula ##STR1## in which R.sub.1 is hydrogen, methyl, ethyl, phenyl, 2-methylphenyl, 3-trifluoromethylphenyl, benzyl, 2-methylbenzyl or vinyl; R.sub.2 is hydrogen, methyl, ethyl or chloro; R.sub.3 is C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 haloalkyl, nitro, p-tolyloxy or p-chlorophenoxy; R.sub.4 is hydrogen or a methyl, methoxy, trifluoromethoxy or halo group at the 2, 4- or 5-position; m is --CH or N; and X is O or NOR.sub.5 in which R.sub.5 is methyl or ethyl; provided that: (a) when R.sub.1 is methyl, and (i) R.sub.3 is methyl, then R.sub.4 is 4-methyl, 4-methoxy or chloro; (ii) R.sub.3 is nitro, then R.sub.4 is methoxy; (b) when R.sub.1 is ethyl, R.sub.3 is methyl or methoxy; (c) when R.sub.2 is chloro, R.sub.3 and R.sub.4 are independently C.sub.1 -C.sub.4 haloalkyl, C.sub.1 -C.sub.4 haloalkoxy or C.sub.1 -C.sub.4 alkoxy; (d) when R.sub.2 is methyl or ethyl, R.sub.1 is hydrogen; (e) when R.sub.3 is hydrogen, R.sub.4 is 2-methyl, halo or methoxy; (f) if M is N, R.sub.3 is C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 haloalkyl or C.sub.1 -C.sub.4 haloalkoxy and R.sub.1 is not ethyl; and (g) if R.sub.1 is vinyl, M is N.

Dependencies are inferred from the claim text.