Importance

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Abstract

A cyanoketone derivative of the following formula (1) ##STR1## wherein A.sub.1 is a substituted or unsubstituted phenyl or naphthyl group or a substituted or unsubstituted heterocyclic group; each of X.sub.1, X.sub.2 and X.sub.3 is independently an oxygen or sulfur atom; each of B.sub.1, B.sub.2 and B.sub.3 is independently a hydrogen atom or C.sub.1 -C.sub.6 -alkyl group; each of Y.sub.1, Y.sub.2, Y.sub.3 and Y.sub.4 is independently a hydrogen atom, a halogen atom or a C.sub.1 -C.sub.6 -alkyl group; and A.sub.2 is a substituted or unsubstituted group selected from the group consisting of a C.sub.1 -C.sub.6 -alkyl group, a C.sub.2 -C.sub.6 -alkenyl group, a C.sub.2 -C.sub.6 -alkynyl group, a C.sub.1 -C.sub.4 -alkoxy group, a C.sub.1 -C.sub.4 -alkylthio group, a C.sub.1 -C.sub.6 -alkoxycarbonyl group, an unsubstituted benzoyl group, a halogen-substituted benzoyl group, a cyano group or a group as defined in A.sub.1 ; provided that when B.sub.1 is a hydrogen atom and B.sub.2 is alkyl, the compound of the formula (1) is an R- or S-enantiomer with regard to asymmetric carbon to which B.sub.1 and B.sub.2 are bonded, or a mixture of these enantiomers. The cyanoketone derivative has a remarkably high herbicidal activity and is effective against a variety of gramineous weeds.

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