Pyrido[2,3-B]pyrazine derivatives useful as herbicidal compounds

摘要

The present invention relates to a method of controlling plants or inhibiting plant growth which comprises applying to the plants or to the locus thereof a herbicidally effective amount of a compound of formula (I) wherein R1, R2, R3, R4 and R5 are as defined in claim 1; or salts or N-oxides thereof. Furthermore, the present invention relates to processes for preparing compounds of formula (I), to herbicidal compositions comprising compounds of formula (I) and to certain novel pyrido[2,3-b]pyrazines.