Herbicidally active pyridyl-/pyrimidyl-pyrazine derivatives

The present invention relates to herbicidally active pyridyl-/pyrimidyl-pyrazine derivatives, as well as to processes and intermediates used for the preparation of such derivatives. The invention further extends to herbicidal compositions comprising such derivatives, as well as to the use of such compounds and compositions in controlling undesirable plant growth: in particular the use in controlling weeds, in crops of useful plants. 本发明涉及除草活性的吡啶基-/嘧啶基-吡嗪衍生物，并且涉及用于制备此类衍生物的方法和中间体。本发明进一步延伸到包含此类衍生物的除草组合物，并且延伸到此类化合物和组合物在有用植物的作物中控制不希望的植物生长的用途、特别是控制杂草的用途。