| 摘要 |
Compounds of formula: <IMAGE> I in which: n=0, 1, 2 f=0, 1 Ar is an optionally substituted phenyl or pyridyl group U a chlorine or bromine atom V a bromine or chlorine or iodine atom B is C1-C10 alkyl, C3-C10 cycloalkyl, which are optionally substituted by 1 to 6 halogen atoms, phenyl or pyridyl or oxidized pyridyl, which are optionally substituted. Use of these compounds as herbicides which are selective but especially antigraminaceous at preemergence.
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