N-acyl-n-phenylmaleamic acid derivatives, methods of producing same, and herbicides containing same as effective components

Abstract From the Canadian patent

An N-acyl-N-phenylmaleamic acid derivative represented by general formula (I) a process for producing the, same, and a herbicide containing the same as the active ingredient which is very useful as a herbicide because it can be widely applied to upland field, lowland orchand, pasture, turf, forest and non-crop land and is highly safe for, crop. In formula(I) X, and Y represent each independently hydrogen or halogen; R1 represents hydrogen halogen, lower alkyl, lower alkenyl, lower alkynyl lower alkoxyalkyl or lower alkoxycarbonylalkyl; R2 represents lower alkyl halogenated lower alkyl or (un)substituted phenyl; R3 represents hydrogen or lower alkyl; and R4 represents hydroxy lower alkoxy, …