CINNOLINE DERIVATIVE, PROCESS FOR PREPARING THE SAME AND HERBICIDAL COMPOSITION CONTAINING THE SAME

A cinnoline derivative having the formula (I): in which X is -OH, -OM, -OR or wherein M is an alkali metal cation, an alkaline earth metal cation or in which R , R and R are the same or different and each is a hydrogen atom, a C1-C6 alkyl group, a C3-C4 alkenyl group, a C3-C4 alkynyl group, a C3-C8 cycloalkyl group, a benzyl group or a phenyl group; R is a C1-C9 alkyl group, a C3-C6 alkenyl group, a C3-C4 alkynyl group, a C1-C3 alkoxy-(C1-C4) alkyl group, a C1-C3 haloalkyl group, a C3-C8 cycloalkyl group, a benzyl group or a phenyl group; and R and R are the same or different and each is a hydrogen atom, a C1-C6 alkyl group, a C3-C4 alkenyl group, a C3-C4 alkynyl group, a C3-C8 cycloalkyl group, a benzyl group in which at most two of hydrogen atoms at the alpha -position thereof may be substituted by methyl group, a C2-C3 hydroxyalkyl group or a phenyl group in which at most three of hydrogen atoms thereof may be substituted by the same or different C1-C2 alkyl group or halogen atom; Y is a C1-C4 haloalkyl group; A and A are the same or different and each is a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a trihalomethyl group, a C1-C2 alkylthio group or a C1-C2 haloalkoxy group, a process for preparing the same, and a herbicidal composition containing the same as an active ingredient, a method for controlling undesired weeds using the same, and use of the same as a herbicide.