| abstract |
A compound of formula (I), wherein Q is a fused heterocyclic group having an N atom in the bridgehead, W is O or S, R<1> and R<2> each are hydrogen or a hydrocarbon group or R<1> and R<2> together with the adjacent N atom may form an N-containing heterocyclic group, R<3> is H, a halogen or a hydrocarbon group, n is an integer of 0 to 2, m is 0 or 1, and a salt thereof, a method of production thereof, an intermediate and agricultural chemicals containing the above compound (I). The compounds (I) of this invention have an excellent herbicidal activity on a variety of weeds in a very low application level and show low damage on culture plants and exhibit an excellent selective herbicidal effect which is long-lasting. They also can be very safely used as herbicides for paddy fields, fields, orchards or non-farmed land, showing substantially no toxicity on mammals or fishes and shell fish without causing substantially any environmental pollution. |