| abstract |
PROCEDURE FOR OBTAINING N-PHENYLSULFONIL-N -PYRIMIDINYL- AND -TRIACINYL-UREAS AND THEIR SALTS, OF FORMULA (I), IN WHICH E IS THE METINIC OR NITROGEN GROUP; Z IS OXYGEN OR SULFUR; M VALE 1 O 2; AND A, X, R, R, R AND R CAN BE SEVERAL TYPES OF RADICALS; COMPOUNDS THAT HAVE APPLICATIONS IN AGRICULTURE AS HERBICIDES. IT CONSISTS OF THE REACTION OF A FENYLSULFONYL DERIVATIVE OF FORMULA (II) WITH A COMPOUND OF FORMULA (III), IN WHICH T CAN BE SEVERAL TYPES OF RADICALS AND THE OTHER SYMBOLS HAVE THE SAME MEANING AS IN THE FORMULA (I). THE REACTION IS CARRIED OUT IN AN INERT APROTIC ORGANIC SOLVENT, IN THE PRESENCE OF A BASE AT TEMPERATURES BETWEEN -20 C AND 120 C. |