| abstract |
The invention provides herbicidal triazolesulphonamides, processes for their preparation and compositions containing them, the compounds being of the formula:n and the salts thereof, where R a represents hydrogen and R b represents a group R³CONHCR²=CR¹-, or R a and R b together represent a chain of formula n-C(R³)=N-C(R²)=C(R¹)- or n-C(=Y)-N(R⁶)-C(R²)=C(R¹)-, where R¹, R² and R³, which may be the same or different, each represent hydrogen, hydroxy, mercapto, halo, cyano, amino, alkylamino, dialkylamino, or substituted or unsubstituted alkyl, aryl, aralkyl, alkoxy or alkylthio, Y is oxygen or sulphur, and R⁶ is hydrogen or a substituted or unsubstituted alkyl or aryl group; or R¹ and R² together represent -CH=CH-CH=CH- or -(CH₂) n - where n is 3, 4 or 5; R⁴ represents substituted phenyl or a substituted or unsubstituted aralkyl or heteroaryl group; and R⁵ represents hydrogen, acyl, carboxy, lkoxycarbonyl, alkylsulphonyl, or a substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl or aralkyl group, or a group of the formula:n where R a and R b are as defined hereinbefore. |