| 摘要 |
A cyanoketone derivative of the following formula (1) <IMG> ...(1) wherein A1 is a substituted or unsubstituted phenyl or naphthyl group, or a substituted or unsubstituted heterocyclic group; each of X1, X2, X3 and X4 is independently an oxygen or sulfur atom; each of B1, B2 and B3 is independently a hydrogen atom or a C1 to C6 alkyl group; each of Y1, Y2, Y3 and Y4 is independently a hydrogen atom, a halogen atom or a C1 to C6 alkyl group; and each of A2 and A3 is independently selected from the group consisting of a hydrogen atom, a substituted or unsubstituted a C1 to C6 alkyl group, a C2 to C6 alkenyl group, a C1 to C4 alkoxy group, a C1 to C4 alkylthio group, a C1 to C6 alkoxycarbonyl group, a cyano group and a group as defined in A1; provided that both A2 and A3 can form a saturated or unsaturated ring which may contain a hetero atom and that when B1 is a hydrogen atom and B2 is alkyl, the compound of the formula (1) is an R- or S-enantiomers with regard to the asymmetric carbon to which B1 and B2 are bonded or a mixture of these enantiomers. The cyanoketone derivative has a extremely high herbicidal activity and is effective against a variety of gramineous weeds.
|
