| 摘要 |
NEW MATERIAL:2-Cyanobenzenesulfonamide derivatives of formula I (R is ethyl, isopropyl). EXAMPLE:2-Cyano-N-(2',6'-diethylphenyl)benzenesulfonamide. USE:Preventive for plant diseases: in particular, they show remarkable effect on sheath blight in rice plant and damping-off in tomato and cucumba. They are very low-toxicity because they are free from heavy metals. They show no toxicity on men, breeds and fishes and low side-effects on crops. PROCESS:The reaction of a compound of formula II with another compound of formula III is conducted in the presence of a base as an acid acceptor to give the compound of formula I. |
