The present invention relates to herbicidal substituted phenyl-pyridazine-diones and substituted phenyl-pyridazinone derivatives of formula (I), 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, such as broad-leaved dicotyledonous weeds, in crops of useful plants.本發明涉及具有式 (I) 之除草的經取代的苯基-嗒?-二酮和經取代的苯基-嗒?酮衍生物，連同用於製備此類衍生物的方法和中間體。本發明進一步延伸到包含此類衍生物的除草組成物，連同此類化合物和組成物在有用植物的作物中控制不希望的植物生長中之用途，特別是在控制雜草例如闊葉雙子葉雜草中之用途。
