| abstract |
The invention relates to a process for the preparation of 2- (2-nitrobenzoyl) -1,3-cyclohexanedione derivatives for use as herbicides in agriculture. The aim of the invention is to provide novel compounds with strong herbicidal properties and low phytotoxicity for selective weed control in agricultural crops. According to the invention, compounds of the formula are prepared in which, for example, R 1 is hydrogen or a C 1 -C 4 -alkyl group, R 2 is hydrogen, a C 1 -C 4 -alkyl group or a ROCO-grouping, 0forin R a is a C 1 -C 4 -alkyl group, R 1 and R 2 together are an alkylene group having 3 to 6 carbon atoms, R 3 is hydrogen or a C 1 -C 4 -alkyl group, R 4 is hydrogen or a C 1 -C 4 -alkyl group, R 5 is hydrogen or a C 1 -C 4 -alkyl group, R 6 is hydrogen or a C 1 -C 4 -alkyl group and R 7 and R 8 independently of one another are (1) hydrogen, (2) halogen, (3) a C1-C 1 alkyl group, (4) a C 1 -C 4 alkoxy group, (5) an OCF 3 group, (6) a cyano group, (7) a nitro group, (8) a C 1 -C 4 -haloalkyl group, and the like. a. Formula DD # AP |