| abstract |
PURPOSE: To prepare the subject new compounds each of which is a certain benzoylcyclohexanedione having a haloalkoxy group at the 4-position on the phenyl ring and is useful as a herbicide and a plant growth regulator. n CONSTITUTION: Each of these compounds is a compound represented by formula I (wherein: (n) is an integer of 0 to 6; R 1 is an alkyl, a cycloalkyl or phenyl group; R 2 is a halogen, NO 2 , CN, an alkyl, a haloalkyl or an alkoxy group, or the like; R 3 is H, a halogen, an alkyl or an alkoxy group; and R 4 is a haloalkyl group), such as a compound in which: n=0; R 2 is F; R 3 is H; and OR 4 is OCH 2 F. This preparation comprises, for example: allowing a cyclohexanedione represented by formula II to react with an acid chloride represented by formula III to obtain an enol ether represented by formula IV; and then, subjecting the enol ether to rearrangement in the presence of a cyanide source or Lewis acid. n COPYRIGHT: (C)1992,JPO |