| abstract |
According to the invention, compounds of formula (I) are prepared or a zwitterion or imide derivative thereof; wherein R1, R2 and R3 are independently optionally substituted alkyl, or R1 and R2 together with the nitrogen to which they are attached form a 5- or 6-membered heterocyclic ring; R4 is hydrogen, nitro, halo, alkyl or CF3; R5 is halogen and Z is an anion which is useful as broad spectrum herbicides. Formula (I) |