Condensed heterocyclic derivatives and herbicides

摘要

PCT No. PCT/JP93/00909 Sec. 371 Date Mar. 1, 1994 Sec. 102(e) Date Mar. 1, 1994 PCT Filed Jul. 2, 1993 PCT Pub. No. WO94/01415 PCT Pub. Date Jan. 20, 1994A condensed heterocyclic derivative of the formula (I): <IMAGE> (wherein R is a hydroxyl group, R3 or R4 is an alkoxy group, W is an oxygen atom, Yn is a hydrogen atom, Z is a methine group, and A is a 5- or 6-membered heterocyclic ring which may be substituted, and a herbicide, are presented. When used for paddy field treatment, upland soil treatment and foliage treatment, the condensed heterocyclic derivative of the present invention exhibits excellent herbicidal activities against gramineous and non-gramineous weeds without adversely affecting crop plants.