A compound represented by the formula (I) is provided: wherein R1,R2, and R3 is a C1-6alkyl group R4 and R5 is a hydrogen atom or A is a mono or dicyclic condensed ring aryl group G is a hydrogen atom... etc.式(I)表示的嗒酮化合物是作為除草劑的有效成分而有用的化合物。(式中,R1、R2、R3表示C1-6烷基等,R4及R5表示氫等,A表示單環式或二環式縮合環的芳基等,G表示氫等)