Abstract: The present invention is to provide an oxopyrazine derivative having an excellent herbicidal activity and besides exhibiting high safety for useful crops and the like, or a salt thereof, and a herbicide containing the same. The present invention relates to an oxopyrazine derivative represented by formula [I]: wherein X1 represents an oxygen atom or a sulfur atom; X2 represents CH or N(O)m; m represents an integer of 0 or 1; R1 represents a hydrogen atom, a C1-C12 alkyl group and the like; R2 represents a halogen atom, a cyano group and the like; R3 is a hydroxyl group, a halogen atom and the like; A1 represents C(R4R5); A2 represents C(R6R7) or C?O; A3 represents C(R8R9); R4 to R9 represent a hydrogen atom or an alkyl group, or a salt thereof, and a herbicide containing these compounds.

Abstract: A process for production of a (1H-1,2,4-triazol-1-yl)benzene compound represented the general formula (5) [wherein R is a C1 to C6 alkyl group or a cyclic C1 to C6 alkyl group; A1 is a hydrogen atom, an amino group, a mono(C1 to C6 alkyl)amino group or a di(C1 to C6 alkyl)amino group; and A2 is a halogen atom, a C1 to C6 alkyl group or a cyclic C1 to C6 alkyl group], which comprises reacting a triazole compound represented by the general formula (2) (wherein A1 has the same definition as given above) with a phenylboronic acid compound represented by the general formula (3) (wherein R and A2 have the same definitions as given above) or a phenylboroxine compound represented by the general formula (4) (wherein R and A2 have the same definitions as given above) in the presence of a copper catalyst.