The invention provides compounds of formula: wherein R and R1 independently represent hydrogen, optionally halogenated alkyl alkenyl or alkynyl;, -(-CR3R4)n-(optionally subtituted phenyl); -(-CR3R4)nHet; or, -(-CR3R4)n-Ar, wherein Ar is an optionally substituted bicycle;, wherein at least one of the groups R and R1 represents -(-CR3R4)n-Ar;, R2 represents R5 or optionally substituted phenyl;, X is oxygen or sulphur; m is 0, 1, 2 or 3;, R3 and R4, independently represent hydrogen, alkyl or haloalkyl;, R5 is halogen, optionally halogenated alkyl, alkenyl or alkynyl;, or a group selected from cyano, nitro, -CO2R6, -S(O)pR6, -NR3R4, -COR6, -S(O)pR7, -CO2R7, -OR7, -CONR3R4, -OSO2R7, -OSO2R8, -OCH2R7, -N(R3)COR8, -N(R3)SO2R8, -N(R3)SO2R7, -SO2NR3R4, -Si(R8)3 and -OR6;, n is zero, 1 or 2; q is zero or an integer from 1 to 5;, Het represents an optionally substituted heterocycle;, R6 represents hydrogen, alkyl or haloalkyl;, p is zero, one or two; r is one or two;, R7 represents optionally substituted phenyl;, R8 represents alkyl or haloalkyl;, R61 and R62 independently represent hydrogen, halogen, alkyl or haloalkyl;, and agriculturally acceptable salts thereof;, which possess utility as herbicides.