| abstract |
Compounds of formula I <CHEM> wherein: R represents an optionally substituted alkyl or an optionally substituted cycloalkyl group; R<1> represents halogen, -O(CH2)m OR<5>, cyano, -SR<5>, R<5,> -CO2R<5>, OR<5> or alkyl substituted by OR<5>; R<2> and R<3> represent halogen, hydrogen, R<5>, alkyl substituted by -OR<5>, nitro, cyano, -OR<5>, -O(CH2)mOR<5> or -CO2R<5>; R<4> and R<5> represent an optionally substituted alkyl group; n represents zero, 1 or 2 and m represents an integer from 1 to 3; and agriculturally acceptable salts of enolic tautomeric forms thereof are useful as herbicides. |