| 摘要 |
NEW MATERIAL:The compound of formula I (X is O or S; R1 and R2 are alkyl, alkenyl, alkynyl, cycloalkyl, lower alkoxy, lower lakoxyalkyl or phenyl; R1 and R2 may together with N form a heterocyclic group). EXAMPLE:1-[4-(4-Cyanophenoxy)-phenoxy]-propionic acid (N-methyl-N-methoxyaminocarbonyl)methyl ester. USE:A selective herbicide exhibiting strong herbicidal effect against cockspur- grass in paddy rice field. PREPARATION:The compound of formula I can be prepared by reacting the compound of formula II with the compound of formula III in the presence or absence of a solvent (e.g. dichloromethane), in the presence of a base such as triethylamine, at 0-150 deg.C. |
