Herbicidal compounds of formula (I)
l. A compound of formula (I)
 or a zwitterion or imide derivative thereof; wherein R¹, R² and R³ are each independently optionally substituted alkyl or R¹ and R² together with the nitrogen atom to which they are attached form a 5- or 6-membered heterocyclic ring;
R⁴ is hydrogen, nitro, halo, alkyl or CF₃;
R⁵ is halo; and
and is an anion.
Process for preparing these compounds and compositions containing them are also described.  
                            式 (I) 的除草化合物
l.式(I)化合物
 或其齐聚物或
亚胺衍
生物;其中 R¹、R² 和 R³ 各自独立地为任选取代的烷基,或 R¹ 和 R² 与它们所连接的氮原子一起形成 5 或 6 元杂环;
R⁴ 是氢、硝基、卤代、烷基或 CF₃;
R⁵ 是卤代;以及
是阴离子。
还描述了制备这些化合物和含有这些化合物的组合物的工艺。