IMIDAZOPYRIDAZINE DERIVATIVE

摘要

PROBLEM TO BE SOLVED: To provide a synthetic intermediate for producing a herbicide exhibiting a significant effect for control of sulfonylurea herbicide-resistant weeds in paddy field and capable of reducing the number of active ingredients in a combined preparation. SOLUTION: An imidazopyridazine derivative represented by formula IIa, IIb, IIc or IId (wherein R1 is a halogen atom; R2 is a hydrogen atom; R3 is a 2-4C alkyl group or a cyclopropyl group) or its salt has high weeding effect on sulfonylurea herbicide-resistant weeds in wide range, compared with weeding effects of other compounds. COPYRIGHT: (C)2006,JPO&NCIPI