abstract |
(57) The present invention relates to a compound of the formula (I) Wherein R 1 , R 2 , R 3 , R 4 , A 1 , A 2 , X and n are as defined in claim 1. This compound and its salts are suitable as herbicides or plant growth regulators. This compound (I) can be prepared, in part, by the novel intermediate products of formulas (III) and (V), for example, by the process disclosed in claim 7. |