| 摘要 |
The invention provides certain herbicidal pyrazolopyrimidine derivatives, processes for their preparation, and compositions containing them, the compounds being of the formula: <CHEM> and salts thereof, where: R<1> and R<2>, which may be the same or different, each represent hydrogen, hydroxy, halo, substituted or unsubstituted alkyl, alkoxy, alkylthio, alkenyl, alkynyl or phenyl, or heterocyclyl; R<6> represents hydrogen, halo, cyano, carboxy, alkoxycarbonyl, or substituted or unsubstituted alkyl or carbamoyl; or R<6> and one of R<1> and R<2> together represent an alkylene chain of 3 or 4 carbon atoms: R<3> represents hydrogen, alkyl, aryl, aralkyl, carboxy, substituted or unsubstituted alkoxycarbonyl, carbamoyl or thiocarbamoyl, cyano or nitro; X represents -NR-SO2-, -SO2-O-, -SO2-NR- or -S(O)n-CR min R sec -, where n is 0, 1 or 2 and R, R min and R sec each represent hydrogen, or substituted or unsubstituted alkyl, alkenyl, alkynyl, alkoxycarbonyl, acyl, alkylsulphonyl or arylsulphonyl; and R<4> represents hydrogen, heterocyclyl, or a substituted or unsubstituted alkyl or aryl group. |
