| 摘要 |
The invention relates to ortho-chloro-para-sulphonamido-phenoxyacetic acid derivatives having herbicidal properties and to a process for preparing the same. The claimed ortho-chloro-para-sulphonamido-phenoxyacetic acid derivatives have the structure represented by the general formula I where Rand Rrepresent a heterocycle selected from substituted or non-substituted piperidine, piperazine, pyrrolidine or morpholine. The process claimed by the invention comprises the hydrolysis of the corresponding ethyl esters of ortho-chloro-para-sulphonamido-phenoxyacetic acids in basic medium, in the presence of sodium hydroxide, at an ester:NaOH molar ratio of 1:2.5, for 1 h. |
