| 摘要 |
Ureas and isoureas of the formula <CHEM> wherein W min is O or S A min is H, Cl, Br, alkyl, OCH3, NO2 or CF3; A is a wide variety of ester or thioester groups or derivatives thereof; <CHEM> where R4 is H or CH3 R5 is H, CH3 or OCH3 W is O or S R<IV> is alkyl or alkenyl; and R1 is a pyrimidyl or triazinyl moiety which is optionally substituted; exhibit potent herbicidal activity and may be of interest for regulating plant growth. The compounds can be formulated for use in conventional manner. They may be prepared by a variety of processes, e.g. by reacting a heterocyclic sulfonyl isocyanate or isothiocyanate of formula <CHEM> with an appropriate amine HNR5R1. Some of the compounds V form a further aspect of the invention. They can be made from the corresponding sulfonamide by reaction with CS2 and phosgene. Further intermediates of formula <CHEM> where R<1> is H or a cation of an alkali metal or tertiary amine are also within the scope of the invention. |
