Bicyclic triazolone derivatives and a herbicides containing the same

A bicyclic triazolone derivative of the formula (I):

• J-Ar (I)
• [Wherein J is one of the groups represented by the formula described bellow;
• 48 49
• (wherein R1 is hydrogen, halogen, a C1-6alkyl group, a C2-6alkenyl group, a C2-6alkynyl group, a C3-6cycloalkyl group, a C7-12aralkyl group, a C6-10aryl group, a C1-6alkoxyC1-4alkyl group, a C1-6alkoxy group, a C2-6alkenyloxy group, a C2-6alkynyloxy group, a C7-12aralkyloxy group, a C1-6haloalkoxy group, a C2-6haloalkenyl group, a C6-10aryloxy group, a C1-6alkylthio group, a C2-6alkenylthio group, a C2-6alkynylthio group, a C7-12aralkylthio group, a C6-10arylthio group, a C1-6alkylsulfonyl group, a C2-6alkenylsulfonyl group, a C2-6alkynylsulfonyl group, a C7-12aralkylsulfonyl group, a C6-10arylsulfonyl group, a cyclic-1,3-dioxa-2-yl group, a cyclic-1,3-dithio-2-yl group, a C1-7alkanoyl group, a C7-11arylcarbonyl group, a C2-7alkoxycarbonyl group, a C8-13aralkyloxycarbonyl group, a mono-C1-4 or di(C1-4)alkylcarbamoyl group, an amino group, a C1-7alkanoylamino group, a mono-C1-4 or di(C1-4)alkylamino group, a C1-2alkylenedioxy group, nitro group, hydroxy group, mercapto group, cyano group, carboxyl group, or sulfo group, n is an integer from 1 to a substitutable maximum number),
• Ar is a phenyl group which may be substituted, a pyridyl group or a condensed heterocyclic group with the phenyl group or the pyridyl group which may be substituted] or a salt thereof.