1,3-oxazin-4-one derivatives, herbicides containing the same, and novel intermediates for preparing the same

摘要

PCT No. PCT/JP93/00105 Sec. 371 Date Sep. 30, 1993 Sec. 102(e) Date Sep. 30, 1993 PCT Filed Jan. 28, 1993 PCT Pub. No. WO93/15064 PCT Pub. Date Aug. 5, 1993.1,3-Oxazin-4-one derivatives represented by general formula (I) <IMAGE> (I) wherein R1 is a lower alkyl group, a lower alkenyl group, an aryl group which may be substituted, or an aralkyl group which may be substituted; R2 is a hydrogen atom or a lower alkyl group; R3 is a lower alkyl group, an aryl group which may be substituted, or an aralkyl group which may be substituted; and R4 and R5, independently, each is a lower alkyl group, or R4 and R5, taken together with the carbon atom to which they are bonded, combine to form a 3- to 8-membered carbocyclic group which may have a branch of a lower alkyl group. These compounds have broad herbicidal spectra and potent herbicidal activities and in addition high safety to useful crops, so that they are useful as herbicides.