| 摘要 |
An improved process for preparing N-phosphonomethylglycine is described. In this process, a glycine substituted on the nitrogen by a radical which can be removed by hydrogenolysis is first reacted with formaldehyde and phosphorous acid in aqueous acidic reaction medium to give a corresponding N-substituted N-phosphonomethylglycine, from which the substituent originally present on the nitrogen is then removed by hydrogenolysis. N-Phosphonomethylglycine is a herbicidal active substance having a broad spectrum of action, which has only a few or no residual effects whatsoever. |
