Herbicidally active substituted phenylsulfonyl urea derivatives of the formula ##STR1## in which X is phenyl or phenoxy, R is ##STR2## R.sup.1 and R.sup.2 each independently is methyl or methoxy. They are made from phenylisocyanates of the formula --SO.sub.2 --N.dbd.C.dbd.O which are produced by reacting a phenylsulfonamide of the formula ##STR3## with phosgene or with trichloromethyl chloroformate in the presence of an aliphatic isocyanate.
公式为 ##STR1## 的具有除草活性的取代苯基磺酰基
脲衍
生物,其中X为苯基或苯氧基,R为 ##STR2## R.sup.1和R.sup.2各自独立地为甲基或甲氧基。它们由公式为--SO.sub.2--N.dbd.C.dbd.O的苯基
异氰酸酯制成,该
异氰酸酯通过将公式为 ##STR3## 的苯基磺酰胺与
光气或三
氯甲基
氯甲酸酯在脂肪族
异氰酸酯的存在下反应而制得。